Labradorite
Feldspar group, Plagioclase series, Labradorite · Semi-Precious Gemstone and Decorative Stone
Crystal System
Triclinic, typically found in massive, granular, or tabular crystal habits
Mineral Group
Silicates, specifically Tectosilicates (Feldspar group)
Chemical Formula
(Na,Ca)(Al,Si)4O8
Formation Process
Igneous and metamorphic processes, crystallizing slowly from cooling magma in mafic igneous rocks like gabbro, basalt, and anorthosite
About This Crystal
A polished, tumbled pebble showing an olive-green to dark grey body color with characteristic iridescent flashes of blue and yellow light. It features opaque to translucent areas with a vitreous to pearly luster and dark surface inclusions.
Physical Characteristics
Dark grey to green body color with a white streak. Perfect cleavage in two directions at nearly right angles. Conchoidal to uneven fracture. Specific gravity ranges from 2.68 to 2.72. Brittle tenacity with good hardness.
Optical Properties
Biaxial with two refractive indices ranging between 1.559 and 1.568. Exhibits strong labradorescence, a unique optical phenomenon of iridescent color flashes caused by light interference from microscopic lamellar intergrowths.
Hardness & Durability
Origin Region
Madagascar, Finland, Canada (Labrador), Australia, Mexico, and the USA
Hardness & Durability
Mohs hardness of 6 to 6.5. Moderate to good durability, but has distinct cleavage which makes it susceptible to chipping if struck hard against a surface.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, harsh chemicals, and prolonged exposure to acids or extreme heat. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Common to moderately common, though high-grade gem-quality material with vibrant multi-colored labradorescence is more valuable. Prices range widely depending on size and quality of the optical flash.
Special Characteristics
Displays prominent labradorescence (schiller effect) with flashes of electric blue and gold when viewed at specific angles under direct light.
Lore & History
Discovered on the Isle of Paul in Labrador, Canada, in 1770. In Inuit lore, the stone is said to have fallen from the frozen fire of the Aurora Borealis. In modern metaphysical practices, labradorite is considered a stone of transformation, enhancing intuition and protecting the aura.