mineral

Lepidolite

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

Hardness: 2.5-3 (Mohs). Color: Pink, lilac, or purple-gray. Luster: Vitreous to pearly. Crystal structure: Monoclinic (often found as micaceous flakes or massive granular aggregates). Cleavage: Perfect basal. Specific gravity: 2.8-2.9.

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

Identified July 5, 2026More mineral →

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Physical properties

Formation & geological history

Formed in granitic pegmatites where high concentrations of lithium are present. It is one of the major sources of the rare alkali metals lithium, rubidium, and cesium.

Uses & applications

Used as a secondary source of lithium (crucial for rechargeable batteries), in high-temperature glass and ceramics, and as a popular gemstone for lapidary work and metaphysical collections.

Geological facts

Lepidolite is known as the 'peace stone' because it naturally contains lithium, which is used in mood-stabilizing medications. It is often found associated with other lithium minerals like tourmaline and spodumene.

Field identification & locations

Identified by its distinctive lilac-to-purple color and micaceous (shimmery, flakey) texture. It can be scratched with a copper penny. Common in Brazil, Canada, and the United States (Maine, California).