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The crystal structure of stilpnomelane. Part III: Chemistry and physical properties

Published online by Cambridge University Press:  05 July 2018

R. A. Eggleton  and
B. W. Chappell
R. A. Eggleton
Affiliation:
Department of Geology, Australian National University, Canberra, A.C.T
B. W. Chappell
Affiliation:
Department of Geology, Australian National University, Canberra, A.C.T
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Summary

Full chemical analysis, cell dimensions, γ refractive index, density, and infra-red absorption spectrum have been determined for fourteen stilpnomelanes. Coupled with data from previously described material and electron probe analyses of three further samples, the new information shows that γ = 1·616+0·0047 Fe3+ −0·0037 Mg; substitution of Mn for Fe appears to have little effect on γ. For ferrostilpnomelane, D = 2·85−0·011 Mg, for ferristilpnomelane, D = 2·89−0·011 Mg. Cell dimensions clearly distinguish ferro-, ferri-, and man-ganstilpnomelanes; for ferri-stilpnomelane a = 22·03−0·00446 Mg−0·00786 Fe3+ (Å). A convenient approximation to the structural formula using a ⅛ subcell, is K0·6(Mg, Fe2+Fe3+)6Si8Al(O,OH)27 2–4 H2O.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 323 , September 1978 , pp. 361 - 368
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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