Labradorite
Feldspar group, plagioclase series, labradorite variety · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Triclinic; typically forms massive, granular, or tabular crystals with well-developed twinning.
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
(Na,Ca)(Al,Si)4O8
Formation Process
Igneous and metamorphic processes, particularly crystallizing slowly from cooling magmas, commonly in mafic intrusive rocks like gabbro, basalt, and anorthosite.
About This Crystal
A polished, blocky mineral specimen exhibiting dark gray to greenish-gray body tones. It features distinctive internal fractures and a striking flash of colorful iridescence (labradorescence) on its upper polished facet, shifting between bronze, gold, and faint blue hues.
Physical Characteristics
Dark gray to smoky body color with white streak. Good cleavage in two directions at approximately 87 degrees. Conchoidal to uneven fracture. Specific gravity is around 2.71 to 2.74. Brittle tenacity. Generally inert to UV light.
Optical Properties
Biaxial positive with two refractive indices ranging between 1.559 and 1.568. Exhibits strong labradorescence, a schiller effect caused by sub-microscopic lamellar intergrowths of plagioclase feldspars refracting light.
Hardness & Durability
Origin Region
Madagascar, Canada (Labrador), Finland, Australia, Russia, and Mexico. Found in mafic igneous rocks.
Hardness & Durability
Mohs hardness of 6 to 6.5. Fair to good durability, but vulnerable to sharp impacts due to distinct cleavage planes. Suitable for pendants, earrings, and low-impact rings.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, and harsh chemical cleaners. Store separately from harder gemstones to prevent scratching.
Rarity & Value
Common to uncommon as a bulk mineral, but high-grade gem specimens with intense, multi-colored labradorescence command higher collector values. Generally affordable, ranging from moderate to high depending on flash quality and size.
Special Characteristics
Exhibits prominent labradorescence, an optical phenomenon creating iridescent flashes of peacock blue, green, gold, copper, and yellow depending on the viewing angle.
Lore & History
First discovered on the Isle of Paul in Labrador, Canada, in 1770. In Inuit legend, the Northern Lights were trapped inside the rocks along the coast until a brave warrior freed most of them with a spear blow, leaving some trapped inside. Popular in modern metaphysical practices as a stone of transformation, enhancing intuition, and protecting the aura.