Labradorite
Feldspar group, Plagioclase series (Anorthite-Albite solid solution), variety Labradorite · Semi-Precious Gemstone and Decorative Mineral Specimen
Crystal System
Triclinic, commonly found as massive, granular, or tabular crystals, and carved/polished into towers or cabochons.
Mineral Group
Silicates (Subgroup: Tectosilicates, Feldspar group)
Chemical Formula
(Na,Ca)(Al,Si)4O8
Formation Process
Igneous and metamorphic formation, typically crystallizing slowly from cooling basic magmas like basalt, gabbro, and anorthosite, allowing lamellar intergrowths to form.
About This Crystal
A polished tower displaying dark grey to greenish-grey body color with a characteristic iridescent sheen. The surface is smooth and reflects light, showcasing flashes of blue and gold optical phenomena caused by light interference within micro-lamellar structures.
Physical Characteristics
Color ranges from dark grey, brown, to black with iridescent flashes; white streak; good cleavage in two directions at nearly right angles; uneven to conchoidal fracture; specific gravity around 2.68 to 2.72; brittle tenacity.
Optical Properties
Biaxial positive with two refractive indices ranging generally between 1.559 and 1.568; exhibits strong labradorescence, a specialized form of adularescence characterized by vibrant metallic flashes of blue, green, gold, and sometimes copper.
Hardness & Durability
Origin Region
Labrador (Canada), Madagascar, Finland, Australia, Mexico, and Russia. Found in mafic igneous rocks.
Hardness & Durability
Mohs hardness of 6 to 6.5; fair to good cleavage makes it somewhat vulnerable to sharp impacts; moderate durability suitable for pendants, earrings, and protected rings.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic and steam cleaners, harsh acids, or prolonged exposure to strong alkaline solutions; store separately from harder gems to prevent scratching.
Rarity & Value
Common to uncommon, depending on the quality of the flash and transparency. High-grade specimens with full-spectrum rainbow labradorescence command higher prices. Generally affordable as tumbled stones, towers, and cabochons.
Special Characteristics
Labradorescence is the primary special characteristic, caused by light diffraction through microscopic lamellar intergrowths of albite and anorthite.
Lore & History
Discovered in 1770 on the Isle of Paul in Labrador, Canada, and featured heavily in Inuit folklore, where it was believed to have fallen from the frozen fires of the Aurora Borealis. In modern metaphysical practices, it is considered a stone of transformation, mysticism, and protection, often associated with the throat and third eye chakras.