mineral
Labradorite (likely)
(Ca,Na)(Al,Si)4O8
AI-generated identification · may be incorrectHardness: 6 to 6.5 on the Mohs scale. Color: Dark grey to black base with iridescent blue, green, yellow, or red flashes (labradorescence). Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions. Specific gravity: 2.68 - 2.72.
- Hardness
- 6 to 6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6 to 6.5 on the Mohs scale. Color: Dark grey to black base with iridescent blue, green, yellow, or red flashes (labradorescence). Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions. Specific gravity: 2.68 - 2.72.
Formation & geological history
Formed in igneous rocks, particularly mafic rocks like basalt and gabbro. Also found in metamorphic rocks. Usually forms as phenocrysts in these rocks as magma cools.
Uses & applications
Commonly used in jewelry, cabochons, carved ornaments, and lapidary work. Sometimes used as a decorative building stone.
Geological facts
Known for its optical phenomenon called 'labradorescence', caused by light interference within the mineral's layered structure. First discovered in Labrador, Canada.
Field identification & locations
Identify by observing the play of color (labradorescence) against a dark background when turned in the light. Often found as polished slices, cabochons, or tumbled stones. Common locations include Canada, Madagascar, and Finland.
