mineral

Lepidolite

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

Hardness: 2.5-3.5 on the Mohs scale; Color: Pink, lilac, or purple; Luster: Pearly to vitreous; Crystal Structure: Monoclinic; Cleavage: Perfect basal (peels into thin sheets); Specific Gravity: 2.8–2.9

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

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed primarily in lithium-bearing granitic pegmatites. It is often found associated with other lithium minerals like spodumene and tourmaline. This secondary mineral forms through hydrothermal processes late in the crystallization of a magma body.

Uses & applications

Major ore of lithium used in batteries and heat-resistant glass; used in jewelry as cabochons or beads; popular specimen for mineral collectors due to its distinctive color and lithium content.

Geological facts

Formerly known as 'Lilalite'. It is one of the main sources of the rare alkali metals rubidium and caesium. The 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 to pink color and its micaceous habit (it can be peeled with a fingernail). It is commonly found in Brazil, California (USA), Canada, and Madagascar. Collectors should look for large, well-defined plates or deep purple coloration.

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