mineral
Labradorite (Tumbled)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Hardness of 6 to 6.5 on the Mohs scale, grayish to dark green base color with characteristic multicolored iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystal system, good cleavage in two directions, specific gravity around 2.7.
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Physical properties
Hardness of 6 to 6.5 on the Mohs scale, grayish to dark green base color with characteristic multicolored iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystal system, good cleavage in two directions, specific gravity around 2.7.
Formation & geological history
Forms primarily in mafic igneous rocks such as basalt, gabbro, and anorthosite through slow cooling of magma deep within the Earth's crust or in intrusive bodies.
Uses & applications
Widely used in ornamental jewelry, decorative objects, and as a popular specimen for crystal collectors.
Geological facts
Labradorescence is caused by light interference within microscopic lamellar intergrowths of plagioclase feldspar. It was first discovered in Labrador, Canada, in 1770.
Field identification & locations
Easily identified by its distinctive play of colors (blues, greens, golds) when rotated under a light source. Found globally including Canada, Madagascar, Finland, and parts of the United States.
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