mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
AI-generated identification · may be incorrectHardness of 6-6.5 on the Mohs scale, exhibits vitreous luster and distinct cleavage. Features dark gray to black body color with iridescent flashes of blue, green, and gold known as labradorescence.
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Physical properties
Hardness of 6-6.5 on the Mohs scale, exhibits vitreous luster and distinct cleavage. Features dark gray to black body color with iridescent flashes of blue, green, and gold known as labradorescence.
Formation & geological history
Forms in mafic igneous rocks such as basalt and gabbro, as well as anorthosite, through slow cooling of magma deep within the Earth's crust.
Uses & applications
Widely used as a semi-precious gemstone in jewelry, decorative ornaments, and architectural facing stones.
Geological facts
First discovered in Labrador, Canada, in 1770, labradorite's optical phenomenon is caused by light interference within microscopic lamellar intergrowths.
Field identification & locations
Easily identified by its signature iridescent play-of-colors when rotated in the light. Major deposits occur in Canada, Madagascar, Finland, and Australia.
