| Reference Type | Journal (article/letter/editorial) |
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| Title | A new barium uranyl oxide hydrate mineral, protasite |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Pagoaga, M. K. | Author |
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| Appleman, D. E. | Author |
| Stewart, J. M. | Author |
| Year | 1986 (March) | Volume | 50 |
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| Page(s) | 125-128 | Issue | 355 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_50/50-355-125.pdf+ |
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| DOI | doi:10.1180/minmag.1986.050.355.16Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 3822 | Long-form Identifier | mindat:1:5:3822:9 |
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| GUID | 47d29e50-c4a8-44aa-b17b-c541e6e76280 |
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| Full Reference | Pagoaga, M. K., Appleman, D. E., Stewart, J. M. (1986) A new barium uranyl oxide hydrate mineral, protasite. Mineralogical Magazine, 50 (355) 125-128 doi:10.1180/minmag.1986.050.355.16 |
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| Plain Text | Pagoaga, M. K., Appleman, D. E., Stewart, J. M. (1986) A new barium uranyl oxide hydrate mineral, protasite. Mineralogical Magazine, 50 (355) 125-128 doi:10.1180/minmag.1986.050.355.16 |
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| In | (1986, March) Mineralogical Magazine Vol. 50 (355) Mineralogical Society |
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| Abstract/Notes | Protasite, a new barium-containing member of the uranyl oxide hydrate group, occurs as bright orange pseudo-hexagonal platelets associated with uraninite and uranophane on unidentified rock matrix from Shinkolobwe mine, Zaïre. Protasite is monoclinic, Pn with a 12.295(2), b 7.221(1), c 6.9558(8) Å, β 90.40(2)°, and V 617.50(11) Å3. The tabular pseudo-hexagonal crystals are flattened on {010}, 0.1 mm to 0.5 mm wide and up to 0.1 mm thick. They are biaxial negative, 2 V = 60–65°, β and γ 1.79–1.83, and X = b. Sector twinning is common. Microprobe analysis shows BaO 15.0, UO3 78.0, H2O(diff.) 7.0%. The structural formula is Ba[(UO2)3O3(OH)2]. 3H2O, Z = 2, and density(calc.) = 5.827(3) g cm−3. Complete crystal-structure analysis shows protasite to be the simplest model structure of the uranyl oxide hydrate group. |
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