mineral
Labradorite
(Na,Ca)(Al,Si)4O8
AI-generated identification · may be incorrectHardness of 6 to 6.5 on the Mohs scale, typically dark gray to black with characteristic iridescent flashes of blue, green, and gold known as labradorescence. It has a vitreous to pearly luster and a triclinic crystal system.
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Physical properties
Hardness of 6 to 6.5 on the Mohs scale, typically dark gray to black with characteristic iridescent flashes of blue, green, and gold known as labradorescence. It has a vitreous to pearly luster and a triclinic crystal system.
Formation & geological history
Forms in mafic igneous rocks like basalt and gabbro, as well as anorthosites, through slow cooling of magma deep within the Earth's crust.
Uses & applications
Widely used as a semi-precious gemstone in jewelry and for ornamental carvings due to its striking optical phenomenon.
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 dark base and vibrant flashes of peacock colors when rotated in the light. Major deposits are found in Canada, Madagascar, Finland, and Australia.
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