| Reference Type | Journal (article/letter/editorial) |
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| Title | Greenlizardite, (NH4)Na(UO2)2(SO4)2(OH)2·4H2O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA |
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| Journal | Mineralogical Magazine |
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| Authors | Kampf, Anthony R. | Author |
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| Plášil, Jakub | Author |
| Nash, Barbara P. | Author |
| Marty, Joe | Author |
| Year | 2018 (April) | Volume | 82 |
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| Issue | 2 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/rruff_1.0/uploads/MM82_401.pdf+ |
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| DOI | doi:10.1180/minmag.2017.081.054Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 245023 | Long-form Identifier | mindat:1:5:245023:4 |
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| GUID | 0 |
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| Full Reference | Kampf, Anthony R., Plášil, Jakub, Nash, Barbara P., Marty, Joe (2018) Greenlizardite, (NH4)Na(UO2)2(SO4)2(OH)2·4H2O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA. Mineralogical Magazine, 82 (2). doi:10.1180/minmag.2017.081.054 |
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| Plain Text | Kampf, Anthony R., Plášil, Jakub, Nash, Barbara P., Marty, Joe (2018) Greenlizardite, (NH4)Na(UO2)2(SO4)2(OH)2·4H2O, a new mineral with phosphuranylite-type uranyl sulfate sheets from Red Canyon, San Juan County, Utah, USA. Mineralogical Magazine, 82 (2). doi:10.1180/minmag.2017.081.054 |
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| In | (2018) Mineralogical Magazine Vol. 82 (2). Mineralogical Society |
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| Abstract/Notes | The new mineral greenlizardite (IMA2017-001), (NH4)Na(UO2)2(SO4)2(OH)2·4H2O, was found in the Green Lizard mine, Red Canyon, San Juan County, Utah, USA, where it occurs as a secondary alteration phase. It is associated with ammoniozippeite, boussingaultite and dickite. It forms as light green-yellow blades up to ~0.3 mm long. The mineral is vitreous and transparent with a white streak. It fluoresces greenish blue in 405 nm light. Mohs hardness is ~2. Crystals are brittle with irregular fracture and two cleavages: perfect {001} and good {2$\bar 1$0}. Greenlizardite is easily soluble in room-temperature H2O. The calculated density is 3.469 g cm–3. Optically, it is biaxial (+) with α = 1.559(1), β = 1.582(1) and γ = 1.608(1) (measured in white light). The measured 2V is 88(1)°; the calculated 2V is 87.8°. Dispersion is moderate, r < v. Pleochroism is X = very pale yellow green, Y = pale yellow green and Z = light yellow green; X < Y < Z. The optical orientation is X ≈ c, Y ≈ a and Z ≈ b*. The Raman spectrum exhibits bands attributable to both sulfate and uranyl groups. Electron probe microanalyses (with H2O based on the crystal structure) yielded (NH4)0.98Na1.00U1.96S2.04O18.00H10.02. Greenlizardite is triclinic, P$\bar 1$, a = 6.83617(17), b = 9.5127(3), c = 13.8979(10) Å, α = 98.636(7), β = 93.713(7), γ = 110.102(8)°, V = 832.49(8) Å3 and Z = 2. The crystal structure (R1 = 2.39% for 2542 I > 2σI) contains edge-sharing dimers of UO7 pentagonal bipyramids. The dimers link by sharing corners with SO4 groups to form a [(UO2)2(SO4)2(OH)2]2– sheet based on the phosphuranylite anion topology. Zig-zag edge-sharing chains of NaO6 octahedra link adjacent [(UO2)2(SO4)2(OH)2]2– sheets, forming thick slabs. NH4 bonds to O atoms in adjacent slabs linking them together. H2O groups occupy channels in the slabs and space between the slabs. |
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