mineral
Labradorite
(Ca,Na)(Al,Si)4O8 (Plagioclase Feldspar)
Hardness of 6 to 6.5 on the Mohs scale, typically dark gray to black base color with prominent iridescence (labradorescence) showing flashes of blue, green, gold, and copper. Vitreous to pearly luster, triclinic crystal system, and specific gravity around 2.7.
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Physical properties
Hardness of 6 to 6.5 on the Mohs scale, typically dark gray to black base color with prominent iridescence (labradorescence) showing flashes of blue, green, gold, and copper. Vitreous to pearly luster, triclinic crystal system, and specific gravity around 2.7.
Formation & geological history
Forms in mafic igneous rocks such as basalt, gabbro, and anorthosite as they cool slowly underground, or within metamorphic rocks. It is found worldwide.
Uses & applications
Widely used in ornamental jewelry, decorative carvings, and sought after by mineral collectors for its striking optical phenomenon.
Geological facts
Labradorite was first discovered on the Isle of Paul in Labrador, Canada, in 1770. Its brilliant play of colors is caused by light interfering in the microscopic lamellae (thin layers) of the mineral.
Field identification & locations
Easily identified by its dark, unassuming exterior which transforms into a dazzling display of spectral colors when rotated in the light. Common sources include Canada, Madagascar, Finland, and Australia.
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