mineral
Likely lepidolite-bearing mica or purple fluorite
Lepidolite: K(Li,Al)3(Si,Al)4O10(F,OH)2; alternatively fluorite: CaF2
AI-generated identification · may be incorrectSmall pale lavender specimen with a glassy to pearly luster and apparent cleavage. Lepidolite is Mohs 2.5–3 with perfect basal cleavage; fluorite is Mohs 4, vitreous, and commonly cubic-cleaving.
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Physical properties
Small pale lavender specimen with a glassy to pearly luster and apparent cleavage. Lepidolite is Mohs 2.5–3 with perfect basal cleavage; fluorite is Mohs 4, vitreous, and commonly cubic-cleaving.
Formation & geological history
Lepidolite forms in lithium-rich granite pegmatites during late-stage crystallization; fluorite forms in hydrothermal veins and cavities. The specimen’s exact age and locality cannot be determined from the image.
Uses & applications
Lepidolite is collected as a lithium-bearing mineral and ornamental specimen; fluorite is used industrially as a flux and fluorine source, plus as a gemstone and display mineral.
Geological facts
The lavender color may result from manganese in lepidolite or color centers and impurities in fluorite. A hardness and cleavage test would distinguish them more reliably than appearance alone.
Field identification & locations
Common localities include Brazilian, Madagascan, and U.S. pegmatites for lepidolite, and China, Mexico, England, and the U.S. for fluorite. Avoid scratching the specimen until identified; mica should flake into thin sheets.