mineral
Labradorite (Dark or Black variety)
Labradorite (member of Plagioclase Feldspar group), (Na,Ca)(Si,Al)4O8
AI-generated identification · may be incorrectHardness: 6-6.5 on Mohs scale; Color: Dark grey to black with labradorescence (blue/green/gold flashes); 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 on Mohs scale; Color: Dark grey to black with labradorescence (blue/green/gold flashes); Luster: Vitreous to pearly; Crystal Structure: Triclinic; Specific Gravity: 2.68-2.72.
Formation & geological history
Formed through the crystallization of mafic igneous rocks such as basalt or gabbro; it can also be found in certain metamorphic rocks. Known for being anorthosite-associated.
Uses & applications
Primarily used as a gemstone in jewelry, decorative carvings, interior design (countertops), and as a popular metaphysical or collector's specimen.
Geological facts
The shimmering iridescent effect is called labradorescence, caused by internal lamellar twinning which sub-microscopically scatters light.
Field identification & locations
Identify in the field by looking for the distinct 'schiller' effect when rotated under light. Major locations include Labrador (Canada), Madagascar, Finland, and Norway.
