Lepidolite Granite / Pegmatite
Lithium-bearing Granitic Pegmatite · Mineral Specimen / Lithological Specimen
Crystal System
Monoclinic (Lepidolite, Mica components) and Triclinic/Hexagonal (Feldspar and Quartz matrix), massive to platy habit
Mineral Group
Silicates, specifically Phyllosilicates and Tectosilicates
Chemical Formula
Complex silicate mixture containing K(Li,Al)3(Al,Si,3O10)(F,OH)2 (Lepidolite) within a matrix of KAlSi3O8 (Feldspar) and SiO2 (Quartz)
Formation Process
Igneous crystallization from the volatile-rich residual melts of granitic magmas, specifically late-stage pegmatitic phases
About This Crystal
A coarse-grained rock specimen exhibiting a pinkish-tan to greyish-brown exterior with characteristic silvery-purple micaceous flakes, uneven granular texture, and a sub-vitreous to pearly luster reflecting off cleavage planes of microscopic mica flakes.
Physical Characteristics
Color ranges from pale pink, lilac, to greyish-brown; white streak; perfect basal cleavage in mica components; uneven to splintery fracture; specific gravity approximately 2.6 to 2.9; brittle tenacity
Optical Properties
Biaxial (-) with distinct birefringence visible in thin sections; pearly to vitreous luster on crystal faces
Hardness & Durability
Origin Region
Found globally in granitic pegmatite fields including Brazil, Madagascar, USA (California, Maine), and Russia
Hardness & Durability
Mohs hardness ranges from 2.5 to 3 for the micaceous components and up to 6.5 to 7 for the quartz/feldspar matrix; low durability due to perfect cleavage and soft micaceous layers
Care & Maintenance
Clean with a soft brush and mild soapy water; avoid harsh chemical cleaners, ultrasonic baths, and prolonged exposure to direct sunlight to prevent fading
Rarity & Value
Common as a mineral and rock specimen, though high-grade lepidolite masses are valued for lithium extraction and crystal collecting; affordable price range
Special Characteristics
Contains lithium-rich micas which may exhibit weak greenish-yellow fluorescence under shortwave UV light; rich in volatile elements like fluorine and lithium
Lore & History
Often associated in modern metaphysical practices with emotional healing, stress relief, and tranquility due to its natural lithium content, though these are traditional beliefs rather than scientific claims