Labradorite (specifically Blue Flash variety)
Labradorite (Variety of Anorthite) · Semi-Precious Gemstone / Collector Mineral
Crystal System
Triclinic; often occurs in massive, granular, or blocky habits rather than distinct crystals.
Mineral Group
Silicates; Tectosilicate; Felspar Group (Plagioclase series)
Chemical Formula
(Ca,Na)(Al,Si)4O8 with trace Fe, K, Ba, and Ti
Formation Process
Igneous; forms in mafic igneous rocks like basalt and norite, or deep-seated plutonic rocks like anorthosite.
About This Crystal
A translucent to opaque grey-green mineral that displays a spectacular play of iridescent colors known as labradorescence. Surface shows a vitreous to pearly luster with characteristic lamellar growth structures.
Physical Characteristics
Body color is dark grey/black; streak is white. Perfect cleavage in two directions at almost 90 degrees. Brittle tenacity. Specific gravity 2.68-2.72.
Optical Properties
The image showcases strong labradorescence (interference of light in microscopic exsolution lamellae). Biaxial positive; RI 1.559–1.573; Birefringence 0.008–0.010.
Hardness & Durability
Origin Region
Notable sources include Labrador (Canada), Madagascar, Finland (Spectrolite), and Russia.
Hardness & Durability
6.0–6.5 on Mohs scale. Good hardness but perfect cleavage makes it susceptible to splitting if struck.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid ultrasonics and steam cleaners. Store away from harder stones like Topaz or Diamond to prevent scratching.
Rarity & Value
Common in massive form, but high-quality specimens with full-spectrum flash are Uncommon. Value is determined by the intensity and variety of the flash colors.
Special Characteristics
Exhibits Labradorescence, a schiller effect caused by internal light reflections from sub-microscopic layers of exsolved albite and anorthite.
Lore & History
Discovered in 1770 on Paul Island, Labrador. Inuit lore suggests it fell from the Northern Lights. Traditionally associated with the Third Eye and Crown Chakras; believed to be a stone of transformation and protection.