An Interpretation of the Hydroxyl Contents of Biotites and Muscovites

Warren C. Forbes
Department of Geological Sciences, University of Illinois at Chicago Circle, Chicago, Illinois 60680

Summary: The net cationic charge of the octahedral and tetrahedral layers was calculated from the analyses of 100 biotites and 93 muscovites and compared to the observed hydroxyl contents (OH+F+Cl). The correlation coefficient between these parameters of −0·96 for biotites and −0·82 for muscovites demonstrates that the hydroxyl content in these micas varies in response to cationic substitutions. Thus substitutions in micas involve cation-hydroxyl replacement couples in addition to other modes previously recognized. Tetrasilicic phlogopite, K2Mg6Si8O22(OH)2, which is related to phlogopite by the substitution Al3+ + H+ = Si4+ was synthesized but is not a stable phase under the conditions investigated. This mica crystallizes as a 1M polymorph with a = 5·289(2) Å, b = 9·151(3) Å, c = 10·247(3) Å, β = 100°4(2).

Exchange reactions, such as Al3+ + H+ ⇌ Si4+, between phlogopite and pyroxenes at depth may provide a mechanism for release of H+ within the mantle.

Mineralogical Magazine; June 1972 v. 38; no. 298; p. 712-720; DOI: 10.1180/minmag.1972.038.298.07
© 1972, The Mineralogical Society
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