metamorphic
Likely tumbled lepidolite-bearing mica schist
Lepidolite-rich mica schist; chiefly lepidolite/muscovite mica, quartz, and possibly feldspar
AI-generated identification · may be incorrectLavender-gray, fine-grained and weakly reflective with a blocky tumbled shape; mica gives a pearly luster and Mohs hardness about 2.5–3, while quartz inclusions are harder (7). Exact identification is uncertain from the image alone.
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Physical properties
Lavender-gray, fine-grained and weakly reflective with a blocky tumbled shape; mica gives a pearly luster and Mohs hardness about 2.5–3, while quartz inclusions are harder (7). Exact identification is uncertain from the image alone.
Formation & geological history
A metamorphic rock formed when lithium-rich clay or granitic material was altered by heat and pressure, commonly in granite pegmatite zones; typically Precambrian to Phanerozoic depending on locality.
Uses & applications
Used mainly as a lapidary, decorative, or collector specimen; lepidolite is also a minor lithium source, but this small piece has no practical industrial value.
Geological facts
The purple color commonly comes from manganese in lepidolite mica, though purple quartz, fluorite, or dyed material can look similar.
Field identification & locations
Look for glittery, flaky mica layers, uneven cleavage, and a relatively soft surface; a streak, hardness, and acid test—or gemological analysis—would distinguish it from amethyst or fluorite. Common sources include Brazil, Madagascar, the United States, and Zimbabwe.
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