Labradorite (White)
Plagioclase Feldspar var. Rainbow Moonstone · Semi-Precious Gemstone / Mineral Specimen
Crystal System
Triclinic; typically occurs in massive or cleavable forms; shows poly-synthetic twinning.
Mineral Group
Silicates (Tectosilicate); Plagioclase Feldspar group.
Chemical Formula
(Na,Ca)(Al,Si)4O8
Formation Process
Igneous formation through slow cooling of magma in plutonic environments; also occurs in high-grade metamorphic rocks.
About This Crystal
A translucent to transparent white-to-colorless stone with a vitreous to pearly luster. It features internal shimmering iridescent flashes (labradorescence) in blue, green, and gold.
Physical Characteristics
Color: Colorless to white; Streak: White; Cleavage: Perfect in two directions at nearly 90 degrees; Fracture: Conchoidal to uneven; Specific Gravity: 2.69-2.72; Fluorescence: Weak reddish/blue.
Optical Properties
Refractive Index: 1.540-1.553; Birefringence: 0.007-0.010; Doubly refractive; notable for labradorescence caused by light interference in thin lamellar intergrowths.
Hardness & Durability
Origin Region
Mainly Kerala and Bihar, India; also Sri Lanka, Madagascar, and Canada (Labrador).
Hardness & Durability
Mohs Hardness: 6.0-6.5; brittle toughness; sensitive to pressure and sharp blows due to perfect cleavage planes.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners and steam cleaning; store separately to prevent scratches; sensitive to temperature changes and acids.
Rarity & Value
Moderately common; value is determined by the intensity and coverage of the 'flash' or play of color. Higher clarity with multi-colored flashes commands a premium.
Special Characteristics
Labradorescence (iridescence) and characteristic internal fracture lines that create rainbow 'veins' when light hits at specific angles.
Lore & History
Historically associated with the 'light of the moon' in various cultures. In metaphysical lore, it is believed to be a stone of protection, intuition, and spiritual awakening, often linked to the Crown and Third Eye chakras.