metamorphic
Lepidolite in Pegmatite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)
Hardness: 2.5-3.5 (Mohs); Color: Pale lavender, purple, or gray with white/tan matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect basal cleavage (micaceous flakes).
- Hardness
- 2
- Color
- Pale lavender, purple, or gray with white/tan matrix
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 2.5-3.5 (Mohs); Color: Pale lavender, purple, or gray with white/tan matrix; Luster: Vitreous to pearly; Crystal structure: Monoclinic; Cleavage: Perfect basal cleavage (micaceous flakes).
Formation & geological history
Formed in granitic pegmatites through hydrothermal processes. Lepidolite is a lithium-rich mica that crystallizes during the final stages of magmatic differentiation, often associated with other lithium minerals like spodumene.
Uses & applications
Major source of lithium; used in glass and ceramic production to increase strength and resistance to thermal shock. Also used as a decorative stone and in metaphysical collecting.
Geological facts
Lepidolite is the most common lithium-bearing mineral. It is often referred to as 'the peace stone' in new-age circles and is one of the primary sources for the rare element rubidium.
Field identification & locations
Identify by its distinctive lilac/lavender color and the presence of small, scaly, micaceous flakes that shimmer under light. Commonly found in pegmatite fields in Brazil, Canada, and the USA (California/Maine).
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