mineral
Raw lepidolite–quartz specimen (probable)
Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, with quartz and possibly mica/petalite
AI-generated identification · may be incorrectPurple-to-lilac, pink, gray, and white masses with vitreous to pearly luster; lepidolite is a monoclinic mica with perfect basal cleavage and Mohs hardness 2.5–3, while quartz is hardness 7. Crystals appear layered or platy rather than uniformly granular.
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Physical properties
Purple-to-lilac, pink, gray, and white masses with vitreous to pearly luster; lepidolite is a monoclinic mica with perfect basal cleavage and Mohs hardness 2.5–3, while quartz is hardness 7. Crystals appear layered or platy rather than uniformly granular.
Formation & geological history
Likely formed in a lithium-rich granite pegmatite during late-stage cooling, commonly associated with quartz, tourmaline, feldspar, and spodumene; typically Precambrian to younger, depending on locality.
Uses & applications
Collected as a colorful pegmatite specimen; lithium-bearing lepidolite has limited historical use as a lithium ore, while associated quartz may be used ornamentally. Not generally suitable for construction.
Geological facts
The lilac color commonly comes from manganese; lepidolite is a major indicator mineral for lithium-rich pegmatites. The image is not detailed enough to confirm every component or rule out purple fluorite/amethyst.
Field identification & locations
Look for soft, glittering lavender mica flakes, perfect sheet-like cleavage, and a greasy-to-pearly sheen; quartz will scratch glass, whereas lepidolite will not. Common localities include Brazil, Madagascar, Afghanistan, California, and Zimbabwe.
