Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Monoclinic; commonly occurs in scaly, micaceous, or massive granular habits
Mineral Group
Silicates; Phyllosilicate (Mica Group)
Chemical Formula
K(Li,Al)3(Al,Si)4O10(F,OH)2 with trace Rubidium and Cesium
Formation Process
Igneous; forms in late-stage crystallization of granitic pegmatites, often associated with tourmaline and spodumene
About This Crystal
A violet to lilac-pink mineral with a distinct pearly to vitreous luster. This specimen shows a thick, book-like micaceous habit with characteristic basal cleavage planes visible on the reflecting surface.
Physical Characteristics
Color: Lilac, pink, or purple; Streak: White; Cleavage: Perfect basal (one direction); Specific Gravity: 2.8–2.9; Tenacity: Brittle to elastic in thin sheets
Optical Properties
Refractive Index: 1.525–1.587; Biaxial negative; weak pleochroism; can show a pearly sheen on cleavage faces
Hardness & Durability
Origin Region
Brazil (Minas Gerais), Madagascar, USA (California, Maine), and Zimbabwe; typically found in lithium-bearing pegmatites
Hardness & Durability
Mohs Hardness: 2.5–3.5; very soft and brittle; susceptible to scratching and delamination along cleavage planes
Care & Maintenance
Clean only with a soft, dry cloth; avoid water which can seep between layers; store separately from harder gems; avoid all chemicals and ultrasonic cleaners
Rarity & Value
Common; value is determined by color intensity and size; often inexpensive but high-quality purple 'books' are prized by collectors
Special Characteristics
High lithium content; may show weak cream or yellow fluorescence under UV light; characteristic 'lithium-purple' color helps distinguish it from other micas
Lore & History
Historically recognized as a primary source of lithium; in metaphysical traditions, it is known as the 'Stone of Transition' and is associated with the Crown Chakra for peace and stress reduction.