Labradorite

Labradorite is a plagioclase feldspar renowned for labradorescence, a spectacular play of iridescent color. As light enters the stone it reflects from internal lamellar structures, producing flashes of blue, gold, green, and copper against a gray to dark-gray body. The mineral has the composition (Ca,Na)(Al,Si)4O8, crystallizes in the triclinic system, and shows a vitreous luster, a white streak, and perfect {001} cleavage in massive or tabular habits. Its Mohs hardness is 6 to 6.5 and its specific gravity 2.68 to 2.72. It was first identified on the Isle of Paul in Labrador, Canada, from which it takes its name. Gem-quality material with strong labradorescence is cut for jewelry and ornamental use.

Labradorite is a plagioclase feldspar famous for its spectacular display of iridescent colors called labradorescence. When light enters the stone, it is reflected from internal structures, producing flashes of blue, gold, green, and copper. First discovered on the Isle of Paul in Labrador, Canada.