Labradorite (Spectrolite variety)
Labradorite (a member of the Anorthite-Albite series) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Triclinic; typically found in massive, granular, or compact habits in decorative carvings.
Mineral Group
Silicates; Tectosilicate; Feldspar Group (Plagioclase series)
Chemical Formula
(Na,Ca)(Al,Si)4O8 with trace elements like Iron and Potassium
Formation Process
Igneous formation; crystallizes from cooling magma in mafic rocks like gabbro or norite through slow cooling.
About This Crystal
An opaque to translucent dark grey-black stone with a vitreous to greasy luster. The surface shows a mottled, 'salt and pepper' appearance with internal cleavage planes.
Physical Characteristics
Color: Dark grey/Black base; Streak: White; Fracture: Uneven to conchoidal; Specific Gravity: 2.68–2.72; Cleavage: Perfect in two directions at nearly 90 degrees.
Optical Properties
Displays labradorescence (iridescence) due to light interference in microscopic exsolution lamellae. Biaxial (+) with a refractive index of 1.560–1.570.
Hardness & Durability
Origin Region
Madagascar (most common for small carvings), Canada (Labrador), and Finland (Spectrolite).
Hardness & Durability
Mohs hardness: 6.0–6.5. Moderate durability; brittle tenacity; sensitive to high pressure and sharp impacts due to perfect cleavage.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam cleaners, and harsh chemicals. Store away from harder stones like quartz or topaz.
Rarity & Value
Common (commercial grade); value increases with the intensity and spectrum of the labradorescence. Small carvings are typically affordable ($5-$20 range).
Special Characteristics
Labradorescence: A metallic schiller effect produced by the reflection of light from submicroscopic planes of exsolution within the feldspar.
Lore & History
Historically named after Labrador, Canada (1770). Inuit lore describes it as frozen fire fallen from the Aurora Borealis. Traditionally associated with the Third Eye chakra and 'magic'.