mineral
Labradorite
(Na, Ca)(Si, Al)4O8
AI-generated identification · may be incorrectHardness: 6-6.5; Color: Grey-green to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72
- Hardness
- 6-6
- Color
- Grey-green to black with iridescent flashes
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5; Color: Grey-green to black with iridescent flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72
Formation & geological history
Formed in igneous or metamorphic rocks through the crystallization of magma or via metamorphism of mafic rocks. It is part of the plagioclase feldspar series.
Uses & applications
Predominantly used as a gemstone for jewelry, in cabochons, and as an ornamental stone in architecture and interior design (countertops).
Geological facts
Famous for its 'labradorescence,' a schiller effect caused by light reflecting off microscopic lamellae of alternating composition within the stone. It was first discovered in Labrador, Canada.
Field identification & locations
Identify by rotating the stone to see bright flashes of blue, gold, or green. Common in Canada, Finland (as Spectrolite), Madagascar, and Russia.
