mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Hardness: 6-6.5 Mohs; Color: Gray to black with blue/green/gold iridescence (labradorescence); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs; Color: Gray to black with blue/green/gold iridescence (labradorescence); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72
Formation & geological history
An intermediate to calcic member of the plagioclase series; usually forms in mafic igneous rocks such as basalt and gabbro. Notable for forming in anorthosite massifs.
Uses & applications
Used primarily in jewelry as cabochons or beads, ornamental carvings, and high-end architectural stone (countertops/tiles).
Geological facts
The iridescent flash is known as 'labradorescence' and is caused by light reflecting off sub-microscopic exsolution lamellae within the feldspar. It was first discovered in Labrador, Canada in 1770.
Field identification & locations
Identify by its dark gray body color and the characteristic colorful metallic flash when tilted under light. Commonly found in Canada, Madagascar, Finland, and Norway.
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