mineral

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Hardness: 2.5–3.5 on Mohs scale; Color: Pink, lilac, purplish-gray; Luster: Vitreous to pearly; Crystal Structure: Monoclinic; Cleavage: Perfect basal cleavage (easily flakes like mica); Specific Gravity: 2.8–2.9.

Hardness: 2
Color: Pink, lilac, purplish-gray
Luster: Vitreous to pearly

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in lithium-bearing granitic pegmatites. It forms during late-stage crystallization of magma enriched in lithium and volatiles. Commonly found in Mesozoic to Cenozoic geological formations.

Uses & applications

Source of lithium used in batteries and electronics; also used in glass and ceramic manufacturing to increase heat resistance; widely used as a gemstone and for ornamental carvings or as a collector's specimen.

Geological facts

Lepidolite is one of the major sources of the rare alkali metals rubidium and cesium. Its purple color is caused by trace amounts of manganese. It is often referred to as the 'peace stone' in metaphysical circles due to its high lithium content.

Field identification & locations

Identify in the field by its distinct lilac-purple color and mica-like layered, flaky structure that can be scratched with a fingernail or copper coin. Found often in Brazil, Madagascar, and the United States (Maine and California). Collectors should look for 'book-like' plates or micaceous aggregates.

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Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

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Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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