mineral

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Hardness: 2.5-4; Color: Pink, lilac, to deep purple; Luster: Vitreous to pearly; Crystal structure: Monoclinic (often found in micaceous masses); Cleavage: Perfect basal; Specific Gravity: 2.8-3.0

Hardness: 2
Color: Pink, lilac, to deep purple
Luster: Vitreous to pearly

Identified June 9, 2026More mineral →

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Physical properties

Hardness: 2.5-4; Color: Pink, lilac, to deep purple; Luster: Vitreous to pearly; Crystal structure: Monoclinic (often found in micaceous masses); Cleavage: Perfect basal; Specific Gravity: 2.8-3.0

Formation & geological history

Formed in granitic pegmatites during the late stages of magmatic crystallization. It is often found associated with other lithium-bearing minerals like spodumene and tourmaline.

Uses & applications

Major source of the rare element lithium; used in glass and ceramic production to increase strength and thermal shock resistance. Also used as a minor gemstone and for metaphysical/collector interests.

Geological facts

Lepidolite is a major source of Rubidium, though it is primarily mined for lithium. Its name is derived from the Greek word 'lepidos' for scale, referring to its scaly, micaceous appearance.

Field identification & locations

Identify in the field by its distinct lilac-purple color, low hardness (can be scratched by a fingernail or copper coin), and the presence of small, glittering 'scales' or flakes that peel away like mica.