mineral
Polished labradorite sphere
Labradorite, a plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)
AI-generated identification · may be incorrectTypically Mohs 6–6.5, with a vitreous luster and triclinic crystal structure; the polished dark-gray surface shows subtle blue-gray flashes. The image alone cannot confirm the mineral, and the flash is not clearly visible.
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Physical properties
Typically Mohs 6–6.5, with a vitreous luster and triclinic crystal structure; the polished dark-gray surface shows subtle blue-gray flashes. The image alone cannot confirm the mineral, and the flash is not clearly visible.
Formation & geological history
Labradorite crystallizes as plagioclase in cooling igneous rocks, especially anorthosite and basalt; specimens formed across many geological periods. Its sheen results from light reflecting off fine internal lamellae.
Uses & applications
Polished spheres are sold as decorative and collectible pieces; labradorite is also used in jewelry and ornamental objects.
Geological facts
Its characteristic play of color is called labradorescence, caused by light interference within the feldspar.
Field identification & locations
Look for gray feldspar with blue, green, or gold flashes that shift as it moves; notable sources include Canada, Madagascar, Finland, and Norway. A sphere’s appearance is not sufficient for definitive identification.
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