How to recognise Lithium-Bearing Pegmatite in the Field through Visible Mineral Zoning FRACTIONATION PROGRESSION In the field, pegmatites often reveal their evolution through visible mineral zoning , a reflection of magmatic differentiation as the melt cools and evolves. Early-stage pegmatites → dominated by biotite (dark brown to black). Intermediate-stage pegmatites → show abundant muscovite (silvery). Highly evolved pegmatites → characterized by lepidolite (lilac or purple), which is lithium-
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