mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
AI-generated identification · may be incorrectHardness: 2.5-3 (Mohs scale); Color: Pink, lilac, purplish; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific gravity: 2.8-2.9
- Hardness
- 2
- Color
- Pink, lilac, purplish
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2.5-3 (Mohs scale); Color: Pink, lilac, purplish; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect basal; Specific gravity: 2.8-2.9
Formation & geological history
Formed in granitic pegmatites during the late stages of crystallization; usually occurs with other lithium-bearing minerals like tourmaline and spodumene.
Uses & applications
Major source of lithium; used in glassmaking and ceramics to prevent thermal expansion; also popular for jewelry (cabochons) and as a decorative stone.
Geological facts
Lepidolite is known as the 'peace stone' in folklore and is a primary source of the rare alkali metals rubidium and cesium.
Field identification & locations
Identify by its distinctive lilac color, micaceous layering, and low hardness (can be scratched by a copper coin). Found in Brazil, Madagascar, and the USA (California, Maine).
