Lepidolite
Lepidolite (Potassium Lithium Aluminum Silicate) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Monoclinic; typically occurs in massive, scaly, or micaceous aggregates.
Mineral Group
Silicates (Phyllosilicates); Mica group
Chemical Formula
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Formation Process
Igneous; forms in the late stages of magmatic crystallization within pegmatites, often associated with tourmaline and spodumene.
About This Crystal
A violet to lilac-gray specimen with a pearly to vitreous luster. This tumbled stone is translucent to opaque with a mottled, scaly appearance characteristic of mica flakes.
Physical Characteristics
Color: Lilac, pink, or purple; Streak: White; Cleavage: Perfect basal (one direction); Fracture: Uneven; Specific Gravity: 2.8–2.9; Fluorescence: Occasionally pale pink/cream under UV shortwave.
Optical Properties
Refractive Index: 1.525–1.587; Birefringence: 0.029–0.038; Biaxial negative; often displays a shimmering or 'glittery' effect due to mica platelets.
Hardness & Durability
Origin Region
Brazil (Minas Gerais), Madagascar, Canada, and USA (California/Maine); primarily found in lithium-bearing granite pegmatites.
Hardness & Durability
Mohs Hardness: 2.5–3.5; very soft and brittle; poor durability for jewelry unless protected in a cabochon setting.
Care & Maintenance
Avoid ultrasonic and steam cleaning; clean only with warm soapy water. Store separately as it is easily scratched by almost all other gemstones. Keep away from harsh chemicals.
Rarity & Value
Common; relatively inexpensive. Value is based on color intensity (deeper purples are preferred) and the size of the specimen.
Special Characteristics
High lithium content (often mined as an ore of lithium); characteristic micaceous 'scales' or 'books' in raw form; pearly luster on cleavage surfaces.
Lore & History
Historically recognized as a primary source of lithium. In metaphysical lore, it is known as the 'Stone of Transition' and is associated with the Crown Chakra and stress reduction due to its lithium content.