| Reference Type | Journal (article/letter/editorial) |
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| Title | X-ray study of psilomelane and cryptomelane |
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| Journal | Mineralogical Magazine and Journal of the Mineralogical Society |
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| Authors | Mukherjee, Bibhuti | Author |
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| Year | 1959 (June) | Volume | 32 |
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| Issue | 245 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_32/32-245-166.pdf+ |
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| DOI | doi:10.1180/minmag.1959.32.245.08 |
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| Generate Citation Formats |
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| Mindat Ref. ID | 5509 | Long-form Identifier | mindat:1:5:5509:7 |
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| GUID | 0 |
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| Full Reference | Mukherjee, Bibhuti (1959) X-ray study of psilomelane and cryptomelane. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (245) 166-171 doi:10.1180/minmag.1959.32.245.08 |
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| Plain Text | Mukherjee, Bibhuti (1959) X-ray study of psilomelane and cryptomelane. Mineralogical Magazine and Journal of the Mineralogical Society, 32 (245) 166-171 doi:10.1180/minmag.1959.32.245.08 |
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| In | (1959) Mineralogical Magazine Vol. 32 (245) Mineralogical Society |
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| Abstract/Notes | SummaryPsilomelane has been shown to be orthorhombic with a 8·254, b 13·40, c 2·864 Å. by the application of Lipson's method. The indexing of powder photographs of psilomelane , where R″ includes the bivalent metals Mn, Ba, Ca, Mg, Co) indicates the space-group P21212 (D22) with one molecule per unit cell. Indexing of powder photographs of psilomelane is not satisfactory with Vaux's axes. Fermor's ‘psilomelane’ is cryptomelane, which is tetragonal with a 9·822, c 2·858 Å. Cryptomelane (KR8O16, where R stands for Mn in different valency states, partly replaced by other cations) is body-centred tetragonal with one molecule per unit cell. Fermor's stalactitic ‘psilomelane’ has an inner dull core of cryptomelane and an outer fine-grained crust of pyrolusite in each needle-shaped body. |
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