mineral
Labradorite
(Ca,Na)(Al,Si)4O8
AI-generated identification · may be incorrectHardness: 6-6.5 Mohs; Color: Grey to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at 86 degrees; 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: Grey to black with labradorescence (blue, green, gold flashes); Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at 86 degrees; Specific gravity: 2.68-2.72
Formation & geological history
Forms in mafic igneous rocks like basalt and gabbro, and sometimes in metamorphic rocks. Notable deposits are found in Anorthosite complexes.
Uses & applications
Used primarily in jewelry as gemstones (cabochons), interior decoration (countertops, tiles), and for metaphysical collecting.
Geological facts
Named after the Labrador region in Canada where it was first discovered in 1770. The iridescent effect, called labradorescence, is caused by internal light scattering from submicroscopic exsolution lamellae.
Field identification & locations
Identify by rotating the stone under light to see iridescent flashes. Commonly found in Canada (Labrador), Madagascar, Norway, and Finland (Spectrolite variant).
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