mineral

Lepidolite

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

Hardness: 2.5–3.5 on Mohs scale; Color: Pink, purplish-pink, lilac, or violet; Luster: Vitreous to pearly; Crystal structure: Monoclinic (often found in micaceous masses or plates); Cleavage: Perfect basal cleavage; Specific gravity: 2.8–2.9.

Hardness: 2
Color: Pink, purplish-pink, lilac, or violet
Luster: Vitreous to pearly

Identified June 5, 2026More mineral →

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Physical properties

Formation & geological history

Found primarily in lithium-bearing granitic pegmatites. It forms as a secondary mineral during the late stages of magma crystallization when volatile elements like lithium, fluorine, and rubidium are concentrated.

Uses & applications

A minor source of lithium, used in the manufacturing of heat-resistant glass and ceramics. It is also a popular collector’s stone, often cut into cabochons for jewelry or used for carvings.

Geological facts

Lepidolite is known as the 'peace stone' or 'stone of transition' in metaphysical circles due to its high lithium content (lithium being used in mood-stabilizing medication). It is one of the primary sources of the rare alkali metal rubidium.

Field identification & locations

Identify in the field by its distinctive lilac-purple color and soft, micaceous (glittery/flaky) texture. It is often found associated with other pegmatite minerals like tourmaline and spodumene in places like Brazil, Madagascar, and San Diego County, California.