mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
AI-generated identification · may be incorrectHardness of 6 to 6.5 on the Mohs scale, grayish to dark gray base color, exhibits labradorescence (iridescent flashes of blue, green, gold, and orange), vitreous to pearly luster, triclinic crystal system, good cleavage.
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Physical properties
Hardness of 6 to 6.5 on the Mohs scale, grayish to dark gray base color, exhibits labradorescence (iridescent flashes of blue, green, gold, and orange), vitreous to pearly luster, triclinic crystal system, good cleavage.
Formation & geological history
Forms in mafic igneous rocks such as basalt, gabbro, and anorthosite through slow cooling of magma deep within the Earth's crust or in metamorphic and pegmatitic environments.
Uses & applications
Widely used in ornamental objects, jewelry (cabochons and beads), and as a dimension stone due to its striking optical phenomenon.
Geological facts
Labradorite was first discovered on Paul Island in Labrador, Canada, in 1770, and is famous for its unique optical phenomenon called labradorescence, caused by light interference in lamellar intergrowths.
Field identification & locations
Easily identified by its dark gray appearance in normal light and brilliant, colorful flashes of metallic play-of-color when tilted at specific angles. Found notably in Canada, Madagascar, Finland, and Australia.
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