| Reference Type | Journal (article/letter/editorial) |
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| Title | Hoperanchite, (NH4)2(S2O3), a new mineral from an active vent in a burning bituminous shale |
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| Journal | American Mineralogist |
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| Authors | Kampf, Anthony R. | Author |
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| Adams, Paul M. | Author |
| Ma, Chi | Author |
| Lynch, David K. | Author |
| Year | 2024 (November) |
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| URL | |
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| DOI | doi:10.2138/am-2024-9625Search 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 | 17734485 | Long-form Identifier | mindat:1:5:17734485:7 |
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| GUID | 0 |
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| Full Reference | Kampf, Anthony R., Adams, Paul M., Ma, Chi, Lynch, David K. (2024) Hoperanchite, (NH4)2(S2O3), a new mineral from an active vent in a burning bituminous shale. American Mineralogist. doi:10.2138/am-2024-9625 |
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| Plain Text | Kampf, Anthony R., Adams, Paul M., Ma, Chi, Lynch, David K. (2024) Hoperanchite, (NH4)2(S2O3), a new mineral from an active vent in a burning bituminous shale. American Mineralogist. doi:10.2138/am-2024-9625 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Hoperanchite (IMA2024-017), (NH4)2(S2O3), is a newly approved mineral species from an active vent in a burning bituminous shale at Hope Ranch, Santa Barbara County, California, U.S.A. Hoperanchite occurs as tabular crystals up to about 0.3 mm in diameter. Tablets are flattened on {001} and exhibit the forms {100}, {010}, {0-10}, {110}, and {-1-10}. The mineral is colorless and transparent with vitreous luster and white streak. The Mohs hardness is 2½. The mineral has brittle tenacity, irregular fracture, and one good cleavage on {001}. The measured density is 1.68(2) g·cm−3. The mineral dissolves instantly in room temperature H2O. The mineral is optically biaxial (+), α = 1.602(2), β = 1.616(2), γ = 1.634(2) (white light); 2Vmeas = 84(2)°; orientation Y = b, X ^ a = 20° in obtuse β; nonpleochroic. Electron microprobe analysis provided the empirical formula N1.89H7.40S1.97O3. Hoperanchite is monoclinic, C2, a = 10.2313(5), b = 6.4998(3), c = 8.8098(6) Å, β = 94.611(7)°, V = 583.97(6) Å3, and Z = 4. The crystal structure (R1 = 0.0325 for 1176 I > 2σI reflections) is the same as that of synthetic (NH4)2(S2O3). Hoperanchite is the first thiosulfate mineral that does not contain essential Pb. |
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