Abstract

Rose muscovite is a variety of muscovite with distinctive paragenetic, optical, and chemical characteristics. It occurs in replacement units of complex pegmatites with a hydrothermal Na-Li phase and is the youngest mica to form, even following lepidolite. Indices of refraction are lower than those of normal muscovite, with average values: α= 1.555, β=1.586, γ = 1.592. Chemically the rose muscovites are characterized by the consistent presence of small amounts of Fe2O3, MnO, Li2O, Rb2O and F. The unusual color is not related to the Li20 content but depends upon the essential absence of Fe2 and the dominance of Mn over Fe3.

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