mineral
White mica (likely muscovite)
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂
AI-generated identification · may be incorrectPale pearly to vitreous luster with thin, flexible sheets and perfect basal cleavage; Mohs hardness 2–2.5, monoclinic crystal system. The specimen appears platy and cream-white, though identification from the image is uncertain.
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Physical properties
Pale pearly to vitreous luster with thin, flexible sheets and perfect basal cleavage; Mohs hardness 2–2.5, monoclinic crystal system. The specimen appears platy and cream-white, though identification from the image is uncertain.
Formation & geological history
Muscovite forms in granitic pegmatites and in metamorphic rocks such as schist, through crystallization or metamorphic alteration. Its age depends on the host deposit and can range from ancient Precambrian to much younger.
Uses & applications
Mica is used in electrical and thermal insulation, fillers, paints, and cosmetics; attractive sheet specimens are collected, but this piece appears modest in quality.
Geological facts
Muscovite separates into exceptionally thin, transparent sheets, a property historically used for window panes and insulating materials.
Field identification & locations
Look for stacked, peelable sheets, a pearly sheen, and flexible cleavage flakes; common sources include pegmatites and mica schists worldwide. A small common specimen is typically worth about $2–$15 USD.
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