Labradorite
Feldspar group, Plagioclase series, Labradorite variety · Semi-Precious Gemstone and Decorative Stone
Crystal System
Triclinic, commonly found as massive, granular, or tabular crystals
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
(Ca,Na)(Al,Si)4O8
Formation Process
Igneous and metamorphic processes, primarily crystallizing from cooling magma in mafic intrusive rocks like anorthosite and gabbro
About This Crystal
A polished tumbled stone showing characteristic dark grey to greenish-grey body color with a notable iridescent flash, typically displaying translucent to opaque clarity and a vitreous to greasy luster
Physical Characteristics
Dark grey to greenish body color with a white streak, perfect cleavage in two directions at nearly right angles, uneven to conchoidal fracture, specific gravity around 2.71 to 2.74, and brittle tenacity
Optical Properties
Biaxial positive with refractive indices between 1.559 and 1.570, exhibiting strong labradorescence (schiller effect) due to light interference from microscopic lamellar intergrowths
Hardness & Durability
Origin Region
Canada (Labrador), Madagascar, Finland, Australia, Russia, and the United States
Hardness & Durability
Mohs hardness of 6 to 6.5, moderate toughness, sensitive to thermal shock and harsh acids, requiring careful handling when used in everyday jewelry
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners, harsh chemical detergents, and prolonged exposure to direct sunlight or sudden temperature changes
Rarity & Value
Common to uncommon as a mineral, with high-grade gem-quality specimens exhibiting intense multi-colored flash being moderately valuable and sought after by collectors
Special Characteristics
Exhibits distinct labradorescence, an optical phenomenon creating brilliant flashes of peacock blue, gold, green, and copper colors when viewed at specific angles
Lore & History
Discovered in Labrador, Canada, in 1770, and featured heavily in Inuit folklore linking it to the Northern Lights; in modern crystal healing, it is associated with transformation, strengthening intuition, and balancing the third eye chakra