Lepidolite
Mica var. Lepidolite · Mineral Specimen / Decorative Stone
Crystal System
Monoclinic; typically occurs in massive, scaly, or micaceous aggregates with perfect basal cleavage.
Mineral Group
Silicates (Phyllosilicates); Mica Group
Chemical Formula
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Formation Process
Igneous formation; specifically late-stage crystallization in granitic pegmatites where lithium concentrations are high.
About This Crystal
A lithium-rich mica characterized by a soft lilac, pink, or purplish-gray color. It has a distinctive pearly to vitreous luster and a layered, 'book-like' structure of thin, flexible sheets.
Physical Characteristics
Color: Lilac to pink; Streak: White; Cleavage: Perfect basal (one direction); Fracture: Uneven; Specific Gravity: 2.8–2.9; Fluorescence: Occasionally creamy white or yellow under UV.
Optical Properties
Biaxial (-) with a refractive index of 1.525–1.587. Shows weak pleochroism and a characteristic pearly sheen on cleavage surfaces.
Hardness & Durability
Origin Region
Brazil (Minas Gerais), Madagascar, Canada, and USA (California/Maine). Found in lithium-bearing pegmatites.
Hardness & Durability
Mohs hardness 2.5–3.5. Very low durability; it is easily scratched and can flake or delaminate due to its micaceous structure.
Care & Maintenance
Clean only with a soft, dry cloth or lukewarm soapy water. Avoid ultrasonic cleaners, harsh chemicals, and prolonged soaking. Store away from harder minerals.
Rarity & Value
Relatively common but prized for its lithium content and color. Value is determined by color intensity and the size of the scaly aggregates.
Special Characteristics
High lithium and rubidium content. The layered 'mica' habit allows it to be split into thin, flexible flakes.
Lore & History
Discovered in the 18th century and originally named 'lilalite.' In metaphysical traditions, it is known as a 'stone of transition' and is associated with the third eye and crown chakras for emotional balance.