5199 East Silver Oak Road

East Carbon City, UT, United States

5199 East Silver Oak Road

East Carbon City, UT, United States
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Kampf A.R.,Natural History Museum of Los Angeles County | PlASil J.,ASCR Institute of Physics Prague | Kasatkin A.V.,Russian Academy of Sciences | Marty J.,5199 East Silver Oak Road | And 2 more authors.
Mineralogical Magazine | Year: 2017

The new mineral shumwayite (IMA2015-058), [(UO2)(SO4)(H2O)2]2·H2O, was found in the Green Lizard and Giveaway-Simplot mines, White Canyon district, San Juan County, Utah, USA, where it occurs as a secondary alteration phase. At the Green Lizard mine, it is found in association with calcite, gypsum, plášilite, pyrite, rozenite and sulfur; at the Giveaway-Simplot mine, shumwayite is associated with rhomboclase and römerite. The mineral occurs as pale greenish-yellow monoclinic prisms, elongated on [100], up to ∼0.3 mm long and commonly in subparallel to random intergrowths. The mineral is transparent with a vitreous lustre and has a white streak. It fluoresces bright greenish white under both longwave and shortwave ultraviolet radiation. The Mohs hardness is ∼2. Crystals are brittle with perfect {011} cleavage and irregular fracture. The mineral is slightly deliquescent and is easily soluble in room temperature H2O. The calculated density is 3.844 g cm-3. Optically, shumwayite is biaxial (+/-), with α = 1.581(1), β = 1.588(1), γ = 1.595(1) (measured in white light). The measured 2Vx based on extinction data collected on a spindle stage is 89.8(8)°; the calculated 2Vx is 89.6°. Dispersion is strong, but the sense is not defined because the optic sign is ambiguous. No pleochroism was observed. The optical orientation is X = b, Y ≈ c, Z ≈ a. Energy-dispersive spectrometer analyses (with H2O based on the crystal structure) yielded the empirical formula U2.01S1.99O12.00·5H2O. Shumwayite is monoclinic, P21/c, a = 6.74747(15), b = 12.5026(3), c = 16.9032(12) Å, β = 90.919(6)°, V = 1425.79(11) Å3 and Z = 4. The crystal structure (R1 = 1.88% for 2936 F > 4σF) contains UO7 pentagonal bipyramids and SO4 tetrahedra that link by corner-sharing to form [(UO2)(SO4)(H2O)2] chains along [100]. The chains and isolated H2O groups between them are linked together only by hydrogen bonds. The mineral is named in honour of the Shumway family, whose members account for the discovery and mining of hundreds of uranium deposits on the Colorado Plateau, including the Green Lizard mine. © 2017 The Mineralogical Society.


Kampf A.R.,Natural History Museum of Los Angeles County | Cooper M.A.,University of Manitoba | Nash B.P.,University of Utah | Cerling T.E.,University of Utah | And 5 more authors.
American Mineralogist | Year: 2017

Rowleyite, [Na(NH4,K)9Cl4][ V25+,4+{5+,4+} (P,As)O8]6n[H2O,Na,NH4,K,Cl], is a new mineral species from the Rowley mine, Maricopa County, Arizona, U.S.A. It was found in an unusual low-temperature, apparently post-mining suite of phases that include various vanadates, phosphates, oxalates, and chlorides, some containing NH4+ . Other secondary minerals found in association with rowleyite are antipinite, fluorite, mimetite, mottramite, quartz, salammoniac, struvite, vanadinite, willemite, wulfenite, and several other potentially new minerals. Analyzed δ13C values for the antipinite in association with rowleyite are consistent with a bat guano source. Crystals of rowleyite are very dark brownish green (appearing black) truncated octahedra up to about 50 μm in diameter. The streak is brownish green, the luster is vitreous, very thin fragments are transparent. The Mohs hardness is about 2, the tenacity is brittle, fracture is irregular, there is no cleavage, and the measured density is 2.23(2) g/cm3. Rowleyite is optically isotropic with n = 1.715(5). Electron microprobe analyses yielded the empirical formula [(NH4)8.81Na3.54K2.58)Σ14.93Cl6.29(H2O)16] [(V9.365+V2.644+)Σ12(P5.28As0.725+)Σ6O48]. $ Raman and infrared spectroscopy confirmed the presence of NH4 and H2O. Rowleyite is cubic, Fd3m $Fd\bar{3}m$ , with a = 31.704(14) Å, V = 31867(42) Å3, and Z = 16. The crystal structure of rowleyite (R1 = 0.040 for 1218 Fo > 4σF reflections) contains [V4O16]12+ polyoxovanadate units that link to one another via shared vertices with [(P,As)O4]3- tetrahedra to form a 3D framework possessing large interconnected channels. The channels contain a 3D ordered [Na(NH4,K)9Cl4]6+ salt net, which apparently served as a template for the formation of the framework. In that respect, rowleyite can be considered a salt-inclusion solid (SIS). The rowleyite framework is among the most porous known. © 2017 by Walter de Gruyter Berlin/Boston 2017.


Kampf A.R.,Natural History Museum of Los Angeles County | Nash B.P.,University of Utah | Marty J.,5199 East Silver Oak Road | Hughes J.M.,University of Vermont
Mineralogical Magazine | Year: 2017

Mesaite (IMA2015-069), ideally CaMn2+ 5(V2O7)3·12H2O, is a new mineral from the Packrat mine, Gateway district, Mesa County, Colorado, USA. Crystals of mesaite occur as orangish red blades up to 0.1 mm long and ∼10 μm thick. The streak is light pinkish orange and the lustre is vitreous, transparent. Mesaite has a brittle tenacity, {010} perfect cleavage; fracture is irregular, and no parting was observed. The mineral has a Mohs hardness ≈ 2. The measured density of mesaite is 2.74(1) g cm-3. Mesaite is biaxial (-), α = 1.760(calc), β = 1.780(5), γ = 1.795(5) in white light; the measured 2V value = 81(2)°. Dispersion is strong, r < v, and pleochroism is present in shades of brownish orange. Mesaite is monoclinic, P2/n, with a = 9.146(2), b = 10.424(3), c = 15.532(4) Å, β = 102.653(7)° and V = 1444.7(6) Å3. The strongest four diffraction lines in the powder diffraction pattern are [(dobs in Å, (Iobs), (hkl)]: 10.47 (100) (010), 2.881 (25) (132, 312, 033, 310), 3.568 (24) (114, 123, 213), 3.067 (17) (124, 132, 223). The composition of mesaite was determined by electron microprobe, and yielded an empirical formula of Mn5.32Ca0.56Zn0.31V5.96As0.04O33H23.61 on the basis of 33 O atoms per formula unit (apfu). The atomic arrangement of mesaite was solved and refined to R1 = 0.0600. The structure is formed of zigzag octahedral chains of edge-sharing Mn2+O6 octahedra. Oxygen atoms of the octahedra are shared with V2O7 groups, which link with adjacent octahedral chains to form {010} heteropolyhedral layers. The interlayer region contains Ca atoms and H2O groups. Each Ca bonds to two O6 atoms in the heteropolyhedral layer and to two fully occupied and six partially occupied O (H2O) sites in the interlayer, resulting in an effective Ca coordination of approximately seven. Similar zigzag chains of edge-sharing MnO6 octahedra decorated with V2O7 groups are also found in the mineral fianelite. Mesaite has been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2015-069). The name mesaite is conferred for Mesa County, Colorado, USA. © 2017 The Mineralogical Society.


Kampf A.R.,Natural History Museum of Los Angeles County | Sejkora J.,National Museum | Witzke T.,PANalytical B.V. | Plasil J.,ASCR Institute of Physics Prague | And 3 more authors.
Journal of Geosciences (Czech Republic) | Year: 2017

Rietveldite (IMA2016–081), Fe(UO2)(SO4)2·5H2O, is a new uranyl sulfate mineral described from three localities: Giveaway-Simplot mine (Utah, USA), Willi Agatz mine (Saxony, Germany) and Jáchymov (Western Bohemia, Czech Republic). The mineral rarely occurs in blades up to 0.5 mm long, in association with other post-mining supergene uranyl sulfates and U-free sulfates. Rietveldite is orthorhombic, space group Pmn21, a = 12.9577(9), b = 8.3183(3), c = 11.2971(5) Å, V = 1217.7(1) Å3 and Z = 4. Thin blades are elongated on [001] and flattened on {010}. Rietveldite is brownish yellow; powdery aggregates have yellowish beige color; and it has a white streak. It does not exhibit fluorescence under either long- or short-wave UV. It is transparent to translucent with a vitreous luster. Crystals are brittle, with curved fracture and Mohs hardness ~2. Cleavage is good on {010}, and fair on {100} and {001}. Rietveldite is easily soluble in room-temperature H2O. The density is 3.31 g/cm3. Rietveldite is optically biaxial (+), with α = 1.570(1), β = 1.577(1) and γ = 1.586(1) (white light); 2Vcalc. = 83.3°, 2Vmeas. = 82(1)°. Dispersion is very strong (r > v). Rietveldite exhibits barely noticeable pleochroism in shades of light brownish yellow color, Y < X ≈ Z. The optical orientation is X = b, Y = a, Z = c. Chemical analyses for rietveldite from Giveaway-Simplot (WDS, 4 spots on 2 crystals) provided FeO 9.56, ZnO 1.06, MgO 0.14, MnO 0.10, SO3 26.99, UO3 47.32, H2O (calc.) 15.39, total 100.56 wt. %, which yields the empirical formula (Fe0.79Zn0.08Mg0.02Mn0.01)Σ0.90(UO2)0.99(SO4)2.01·5.10H2O (based on 15 O apfu). Prominent features in the Raman and infrared spectra include the O–H stretching vibrations, symmetric and antisymmetric stretching vibrations of (UO2)2+ ion, and stretching and bending vibrations of symmetrically non-equivalent (SO4)2- groups. The eight strongest powder X-ray diffraction lines are [dobs Å (Irel.) (hkl)]: 8.309(34)(010), 6.477(100)(200), 5.110(58)(210), 4.668(48) (012), 4.653(36)(211), 3.428(41)(013), 3.341(33)(221), 3.238(49)(400). The crystal structure of rietveldite (R1 = 0.037 for 2396 reflections with Iobs > 2σ[I]) contains infinite uranyl sulfate chains of composition [(UO2)(SO4)2(H2O)]2– along [001]. The adjacent chains are linked in the [100] direction by FeO6 octahedra, which share vertices with SO4 tetrahedra resulting in a heteropolyhedral sheet parallel to {010}; adjacent sheets are linked by hydrogen bonding only. The uranyl sulfate chains are the same as those in the structures of several other uranyl sulfate minerals. Rietveldite is named for Hugo M. Rietveld (1932–2016). © 2017, Czech Geological Society. All rights reserved.


Kampf A.R.,Natural History Museum of Los Angeles County | Plasil J.,ASCR Institute of Physics Prague | Kasatkin A.V.,V O Almazjuvelirexport | Marty J.,5199 East Silver Oak Road
Mineralogical Magazine | Year: 2014

The new mineral belakovskiite (IMA2013-075), Na7(UO 2)(SO4)4(SO3OH)(H2O) 3, was found in the Blue Lizard mine, Red Canyon, White Canyon district, San Juan County, Utah, USA, where it occurs as a secondary alteration phase in association with blödite, ferrinatrite, kröhnkite, meisserite and metavoltine. Crystals of belakovskiite are very pale yellowish-green hair-like fibres up to 2 mm long and usually no more than a few mm in diameter. The fibres are elongated on [100] and slightly flattened on {021}. Crystals are transparent with a vitreous lustre. The mineral has a white streak and a probable Mohs hardness of ∼2. Fibres are flexible and elastic, with brittle failure and irregular fracture. No cleavage was observed. The mineral is readily soluble in cold H2O. The calculated density is 2.953 g cm -3. Optically, belakovskiite is biaxial (+) with α=1.500(1), β=1.511(1) and γ=1.523(1) (measured in white light). The measured 2V is 87.1(6)° and the calculated 2V is 88°. The mineral is non-pleochroic. The partially determined optical orientation is X ≈ a. Electron-microprobe analysis provided Na2O 21.67, UO3 30.48, SO3 40.86, H2O 6.45 (structure), total 99.46 wt.% yielding the empirical formula Na6.83(U1.04O2)(SO4) 4(S0.99O3OH)(H2O)3 based on 25 O a.p.f.u. Belakovskiite is triclinic, P1̄, with a=5.4581(3), b=11.3288(6), c=18.4163(13) Å, α=104.786(7)°, β=90.092(6)°, γ=96.767(7)°, V=1092.76(11) Å 3 and Z=2. The eight strongest X-ray powder diffraction lines are [dobs Å (I)(hkl)]: 8.96(35)(002), 8.46(29)(011), 5.19(100)(1̄01,101,1̄10), 4.66(58)(013,1̄02,1̄1̄0,110), 3.568(37)(120,023,005,03̄3), 3.057(59)(01̄6,11̄5,1̄31), 2.930(27)(multiple) and 1.8320(29)(multiple). The structure, refined to R 1=5.39% for 3163 Fo > 4σF reflections, contains [(UO2)(SO4)4(H2O)]6- polyhedral clusters connected via an extensive network of Na-O bonds and H bonds involving eight Na sites, three other H2O sites and an SO 3OH (hydrosulfate) group. The 3-D framework, thus defined, is unique among known uranyl sulfate structures. The mineral is named for Dmitry Ilych Belakovskiy, a prominent Russian mineralogist and Curator of the Fersman Mineralogical Museum. © 2014 The Mineralogical Society.


Kasatkin A.V.,V O Almazjuvelirexport | Nestola F.,University of Padua | Plasil J.,ASCR Institute of Physics Prague | Marty J.,5199 East Silver Oak Road | And 10 more authors.
Mineralogical Magazine | Year: 2013

Two new minerals - manganoblodite (IMA2012-029), ideally Na 2Mn(SO4)2·4H2O, and cobaltoblodite (IMA2012-059), ideally Na2Co(SO4) 2·4H2O, the Mn-dominant and Co-dominant analogues of blodite, respectively, were found at the Blue Lizard mine, San Juan County, Utah, USA. They are closely associated with blodite (Mn-Co-Ni-bearing), chalcanthite, gypsum, sideronatrite, johannite, quartz and feldspar. Both new minerals occur as aggregates of anhedral grains up to 60 mm (manganoblodite) and 200 mm (cobaltoblodite) forming thin crusts covering areas up to 2×2 cm on the surface of other sulfates. Both new species often occur as intimate intergrowths with each other and also with Mn-Co-Ni-bearing blodite. Manganoblödite and cobaltoblodite are transparent, colourless in single grains and reddish-pink in aggregates and crusts, with a white streak and vitreous lustre. Their Mohs' hardness is ∼21/2. They are brittle, have uneven fracture and no obvious parting or cleavage. The measured and calculated densities are Dmeas = 2.25(2) g cm-3 and D calc = 2.338 g cm-3 for manganoblodite and D meas = 2.29(2) g cm-3 and Dcalc = 2.347 g cm-3 for cobaltoblodite. Optically both species are biaxial negative. The mean refractive indices are a = 1.493(2), β = 1.498(2) and γ = 1.501(2) for manganoblodite and a = 1.498(2), β = 1.503(2) and γ = 1.505(2) for cobaltoblodite. The chemical composition of manganoblodite (wt.%, electron-microprobe data) is: Na2O 16.94, MgO 3.29, MnO 8.80, CoO 2.96, NiO 1.34, SO3 45.39, H2O (calc.) 20.14, total 98.86. The empirical formula, calculated on the basis of 12 O a.p.f.u., is: Na1 9 6(Mn0.44Mg0.29Co0.14Ni0.06)Σ0. 93S2.03O8·4H2O. The chemical composition of cobaltoblodite (wt.%, electron-microprobe data) is: Na2O 17.00, MgO 3.42, MnO 3.38, CoO 7.52, NiO 2.53, SO3 45.41, H2O (calc.) 20.20, total 99.46. The empirical formula, calculated on the basis of 12 O a.p.f.u., is: Na1.96(Co0.36Mg0.30Mn 0.17Ni0.12)Σ0.95S2.02O 8·4H2O. Both minerals are monoclinic, space group P21/a, with a = 11.137(2), b = 8.279(1), c = 5.5381(9) Å, β = 100.42(1)°, V = 502.20(14) Å3 and Z = 2 (manganoblödite); and a = 11.147(1), b = 8.268(1), c = 5.5396(7) Å, β = 100.517(11)°, V = 501.97(10) Å3 and Z = 2 (cobaltoblödite). The strongest diffractions from X-ray powder pattern [listed as (d,Å (I)(hkl)] are for manganoblödite: 4.556(70)(210, 011); 4.266(45)(2̄01); 3.791(26)(2̄11); 3.338(21)(310); 3.291(100)(220, 021), 3.256(67)(211, 1̄21), 2.968(22)(2̄21), 2.647(24)(4̄01); for cobaltoblödite: 4.551(80)(210, 011); 4.269(50)(2̄01); 3.795(18)(2̄11); 3.339(43)(310); 3.29(100)(220, 021), 3.258(58)(211, 1̄21), 2.644(21)(4̄01), 2.296(22)(1̄22). The crystal structures of both minerals were refined by single-crystal X-ray diffraction to R1 = 0.0459 (manganoblödite) and R1 = 0.0339 (cobaltoblödite). © 2013 The Mineralogical Society.


Kasatkin A.V.,V O Almazjuvelirexport | Plasil J.,ASCR Institute of Physics Prague | Marty J.,5199 East Silver Oak Road | Agakhanov A.A.,Saint Petersburg State University | And 2 more authors.
Mineralogical Magazine | Year: 2014

Nestolaite (IMA 2013-074), CaSeO3·H2O, is a new mineral species from the Little Eva mine, Grand County, Utah, USA. It is named in honour of the prominent Italian mineralogist and crystallographer Fabrizio Nestola. The new mineral was found on sandstone matrix as rounded aggregates up to 2 mm across and up to 0.05 mm thick consisting of tightly intergrown oblique-angled, flattened to acicular crystals up to 30 μm long and up to 7 μm (very rarely up to 15 μm) thick. Nestolaite associates with cobaltomenite, gypsum, metarossite, orschallite and rossite. The new mineral is light violet and transparent with a white streak and vitreous lustre. The Mohs hardness is 21/2. Nestolaite is brittle, has uneven fracture and perfect cleavage on {100}. The measured and calculated densities are Dmeas. = 3.18(2) g/cm3 and Dcalc. = 3.163 g/cm3. Optically, nestolaite is biaxial positive. The refractive indices are α = 1.642(3), β = 1.656(3), γ = 1.722(6). The measured 2V is 55(5)° and the calculated 2V is 51°. In transmitted light nestolaite is colourless. It does not show pleochroism but has strong pseudoabsorption caused by high birefringence. The chemical composition of nestolaite (wt.%, electronmicroprobe data) is: CaO 28.97, SeO2 61.14, H2O (calc.) 9.75, total 99.86. The empirical formula calculated on the basis of 4 O a.p.f.u. (atoms per formula unit) is Ca0.96Se1.02O3 ··H2O. The Raman spectrum is dominated by the Se-O stretching and O-Se-O bending vibrations of the pyramidal SeO3 groups and O-H stretching modes of the H2O molecules. The mineral is monoclinic, space group P21/c, with a = 7.6502(9), b = 6.7473(10), c = 7.9358(13) Å, β = 108.542 (12)°, V = 388.37(10) Å 3 and Z = 4. The eight strongest powder X-ray diffraction lines are [dobs in Å (hkl) (Irel)]: 7.277 (100)(100), 4.949 (110)(37), 3.767 (002)(29), 3.630 (200)(58), 3.371 (020)(24), 3.163 (2̄02)(74), 2.9783 (1̄ 21)(74) and 2.7231 (112)(31). The crystal structure of nestolaite was determined by means of the Rietveld refinement from the powder data to Rwp = 0.019. Nestolaite possesses a layered structure consisting of CaΦ-SeO3 sheets, composed of edge-sharing polyhedra. Adjacent sheets are held by H bonds emanating from the single (H2O) group within the sheets. The nestolaite structure is topologically unique. © 2014 The Mineralogical Society.


Kampf A.R.,Natural History Museum of Los Angeles County | Plasil J.,ASCR Institute of Physics Prague | Kasatkin A.V.,Russian Academy of Sciences | Marty J.,5199 East Silver Oak Road
Mineralogical Magazine | Year: 2015

The new minerals bobcookite (IMA 2014-030), NaAl(UO2)2(SO4)4•18H2O and wetherillite (IMA 2014-044), Na2Mg(UO2)2(SO4)4•18H2O, were found in the Blue Lizard mine, San Juan County, Utah, USA, where they occur together as secondary alteration phases in association with boyleite, chalcanthite, dietrichite, gypsum, hexahydrite, johannite, pickeringite and rozenite. Bobcookite descriptive details: lime green to greenish-yellow massive veins and columnar crystals; transparent; vitreous lustre; bright greenish-white fluorescence; pale greenish yellow streak; hardness (Mohs) 2; brittle; conchoidal fracture; no cleavage; moderately hygroscopic; easily soluble in cold H2O; densitycalc = 2.669 g cm-3. Optically, biaxial (-), α = 1.501(1), β = 1.523(1), γ = 1.536(1) (white light); 2Vmeas. = 78(1)°; 2Vcalc. = 74°; dispersion r < v, moderate. Pleochroism: X colourless, Y very pale yellow-green, Z pale yellow-green; X < Y < Z. EDS analyses yielded the empirical formula Na0.97Al1.09(U1.02O2)2(S0.98O4)4(H2O)18. Bobcookite is triclinic, P1, a = 7.7912(2), b = 10.5491(3), c = 11.2451(8) Å , α = 68.961(5), β = 70.909(5), γ = 87.139(6)°, V = 812.79(8) Å3 and Z = 1. The structure (R 1 = 1.65% for 3580 F o > 4σF) contains [(UO2)(SO4)2(H2O)] chains linked by NaO4(H2O)2 octahedra to form layers. Hydrogen bonds to insular Al(H2O)6 octahedra and isolated H2O groups hold the structure together. The mineral is named for Dr Robert (Bob) B. Cook of Auburn University, Alabama, USA. Wetherillite descriptive details: pale greenish-yellow blades; transparent; vitreous lustre; white streak; hardness (Mohs) 2; brittle; two cleavages, {101} perfect and {010} fair; conchoidal or curved fracture; easily soluble in cold H2O; densitycalc = 2.626 g cm-3. Optically, biaxial (+), α = 1.498(1), β = 1.508(1), γ = 1.519(1) (white light); 2Vmeas. = 88(1)°, 2Vcalc. = 87.9°; dispersion is r < v, distinct; optical orientation: Z = b, X ⧠a = 54° in obtuse β; pleochroism: X colourless, Y pale yellow-green, Z pale yellow-green; X < Y ≈ Z. EDS analyses yielded the empirical formula Na1.98(Mg0.58Zn0.24Cu0.11Fe2+ 0.09)∑1.02(U1.04O2)2(S0.98O4)4(H2O)18. Wetherillite is monoclinic, P21/c, a = 20.367(1), b = 6.8329(1), c = 12.903(3) Å, β = 107.879(10)°, V = 1709.0(5) Å3 and Z = 2. The structure (R 1 = 1.39% for 3625 F o > 4σF) contains [(UO2)(SO4)2(H2O)] sheets parallel to {100}. Edge-sharing chains of Na(H2O)5O polyhedra link adjacent uranyl sulfate sheets forming a weakly bonded three-layer sandwich. The sandwich layers are linked to one another by hydrogen bonds through insular Mg(H2O)6 octahedra and isolated H2O groups. The mineral is named for John Wetherill (1866-1944) and George W. Wetherill (1925-2006). © 2015 Mineralogical Society.


Kampf A.R.,Natural History Museum of Los Angeles County | Plasil J.,ASCR Institute of Physics Prague | Kasatkin A.V.,Russian Academy of Sciences | Marty J.,5199 East Silver Oak Road | Cejka J.,National Museum
Mineralogical Magazine | Year: 2015

The new minerals fermiite (IMA2014-068), Na4(UO2)(SO4)3·3H2O and oppenheimerite (IMA2014-073), Na2(UO2)(SO4)2·3H2O, were found in the Blue Lizard mine, San Juan County, Utah, USA, where they occur together as secondary alteration phases in association with blödite, bluelizardite, chalcanthite, epsomite, gypsum, hexahydrite, krohnkite, manganoblodite, sideronatrite, tamarugite and wetherillite. Fermiite descriptive details: pale greenish-yellow prisms; transparent; vitreous lustre; bright greenish- white fluorescence; white streak; hardness (Mohs) 2 brittle; conchoidal fracture; no cleavage; slightly deliquescent; easily soluble in RT H2O; densitymeas = 3.23(2) g cm-3; densitycalc = 3.313 g cm-3. Optically, biaxial (+), α = 1.527(1), (β= 1.534(1), γ = 1.567(1) (white light); 2Vmeas = 51(1)°, 2Vcalc = 50°; dispersion r < v, distinct. Pleochroism: X, Y = colourless, Z = pale greenish yellow; X= Y < Z. Energy dispersive spectroscopic (EDS) analyses yielded the empirical formula Na3.88(U1.05O2)(S0.99O4)3(H2O)3. Fermiite is orthorhombic, Pmn21, a = 11.8407(12), b = 7.8695(5), c = 15.3255(19) Å, V= 1428.0(2) Å3 and Z = 4. The structure (R1 = 2.21% for 1951 Io > 3σl) contains [(UO2)(SO4)3] chains that are linked by bonds involving five different Na-O polyhedra to form a framework. The mineral is named for Italian-American theoretical and experimental physicist Dr. Enrico Fermi (1901-1954). Oppenheimerite descriptive details: pale greenish-yellow prisms; transparent; vitreous lustre; bright greenish-white fluorescence; white streak; hardness (Mohs) 2 slightly sectile; three good cleavages, {110}, {011} and {101}; irregular fracture; slightly deliquescent; easily soluble in RT H2O; densitycalc = 3.360 g cm-3. Optically, biaxial (+), α = 1.537(1), β = 1.555(1), y = 1.594(1) (white light); 2Vmeas. = 72(2)°, 2Vcalc = 70°; dispersion is r > v, moderate, inclined; optical orientation: X ≈ {101}, Z ≈ [111]; pleochroism: X very pale greenish yellow, Y pale greenish yellow, Z greenish yellow; X < Y < Z. EDS analyses yielded the empirical formula Na1.94(U0.97O2)(S1.02O4)2(H2O)3. Oppenheimerite is triclinic, P1, a = 7.9576(6), 6 = 8.1952(6), c = 9.8051 (7) Å, α = 65.967(5)' β = 70.281 (5), y = 84.516(6)°, V= 549.10(8) Å3and Z = 2. The structure (Rx = 3.07% for 2337 I0 > 3σI) contains [(UO2)(SO4)2(H2O)] chains that are linked by bonds involving two different Na-O polyhedra to form a framework. © 2015 by Walter de Gruyter Berlin/Boston.

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