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Lithium-bearing mica with composition K2(Li,Al)5–6 [Si6–7Al2–1 O20] (OH,F)4; sp. gr. 2.8–2.9; hardness 2.5–4.0; monoclinic; crystals as small flakes; perfect basal {001} cleavage; lilac to greyish; occurs in late-stage pegmatites associated with other lithium minerals, such as spodumene, and minerals of a pneumatolytic origin, such as tourmaline and topaz. Lepidolite is an important ore mineral of lithium.

Subjects: Earth Sciences and Geography.

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