Geology Home Page
Roger Weller, geology instructor
Chemical Group: silicate-mica
Chemical Formula: (OH,F)2KLiAl2Si3O10 (lithia mica)
Color: rose-red, violet-gray, lilac, yellowish, light gray, white Streak:
Luster: pearly Transparency: translucent
Hardness: 2.5 to 4
Specific Gravity: 2.8 to 3.3
Cleavage: perfect basal cleavage (a mica)
Crystal Forms: Monoclinic
Mineral Associations: Lepidolite is found in granite-pegmatite veins.
Lepidolite is associated with lithium tourmaline (rubellite), spodumene, amblygonite.
Identifying Characteristics: Sparkly masses of small lilac pink mica flakes
Uses: source of lithium (important for batteries); sometimes as a gemstone
Occurrences: Brazil; in the USA from California, Maine, Connecticut
Toxicity: when-swallowed- when inhaled-