Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) · Semi-Precious Gemstone / Collector Mineral / Industrial Mineral (Lithium Source)
Crystal System
Monoclinic; commonly occurs in massive, scaly, or micaceous aggregates rather than distinct large crystals.
Mineral Group
Silicates (Phyllosilicate / Mica Group)
Chemical Formula
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Potassium Lithium Aluminum Silicate Hydroxide Fluoride)
Formation Process
Igneous formation; primarily found in lithium-bearing granitic pegmatites. Formed in late-stage magmatic crystallization.
About This Crystal
A violet to lilac-pink mineral with a pearly to vitreous luster. This specimen is a polished 'palm stone' or 'worry stone' showing a characteristic scaly, granular texture with visible micaceous flakes that catch the light.
Physical Characteristics
Color: Pink, lilac, violet, or gray; Streak: White; Cleavage: Perfect basal (one direction); Specific Gravity: 2.8–2.9; Fluorescence: Occasionally pale yellow or cream under UV light.
Optical Properties
Biaxial negative; Refractive Index: 1.525–1.587; Birefringence: 0.018–0.038. Exhibits a shimmering 'spangled' effect due to light reflecting off internal cleavage planes.
Hardness & Durability
Origin Region
Brazil (Minas Gerais), Madagascar, USA (California, Maine), Canada, and Zimbabwe.
Hardness & Durability
Mohs Hardness: 2.5–3.5. Very soft and brittle; prone to scratching and flaking. Not recommended for rings; best suited for decorative objects or protected pendants.
Care & Maintenance
Clean with a soft, dry or slightly damp cloth only. Avoid ultrasonic cleaners, steam, and harsh chemicals. Very sensitive to heat and pressure. Store separately to prevent scratches.
Rarity & Value
Relatively common in mineral markets. Value is determined by color intensity (deep purples are preferred) and size. Generally inexpensive as tumbled stones or carvings.
Special Characteristics
High lithium content; pearly luster on cleavage faces; notable for its 'shimmer' or 'glitter' caused by the fine-grained mica structure.
Lore & History
Historically recognized as a primary source of lithium (discovered in the 18th century). In metaphysical traditions, it is termed the 'Stone of Transition,' thought to assist in reducing stress and emotional balance due to its lithium content.