mineral

Lepidolite on Pegmatite

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

Hardness: 2.5–3.5 on Mohs scale; Color: Pink, lilac, to purple; Luster: Pearly to vitreous; Crystal structure: Monoclinic (micaceous packets); Cleavage: Perfect basal (peels into thin sheets); Specific gravity: 2.8–2.9

Hardness: 2
Color: Pink, lilac, to purple
Luster: Pearly to vitreous

Identified April 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed in late-stage crystallization of granitic pegmatites. It is a major ore of lithium and often occurs with other lithium minerals like spodumene or tourmaline.

Uses & applications

A primary source of the rare element lithium; used in glass and ceramic production. Also popular for metaphysical jewelry, mineral collecting, and as a raw material for lithium-ion batteries.

Geological facts

Lepidolite is known as the 'peace stone' in folklore due to its high lithium content, which is used in mood-stabilizing medications. It was first described in the 18th century as 'lilalite' before being renamed for the Greek word 'lepis' meaning scale.

Field identification & locations

Identify by its distinctive lilac/purple color and its ability to be easily scratched or peeled into flexible flakes. Often found in places like Brazil, Madagascar, and the United States (California/Maine). Look for shimmering, scaly masses in coarse granite rocks.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Gypsum (variety Selenite or Alabaster)

Calcium sulfate dihydrate (CaSO4·2H2O)

Mineral

Nephrite Jade

Nephrite

Mineral/Rock

Granite

Granite (Phaneritic intrusive igneous rock)

igneous