mineral
Labradorite (Polished Tumbled Stone)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
Hardness: 6-6.5 on the Mohs scale. Color: Dark grey to black base with subtle iridescent schiller/labradorescence. Luster: Vitreous to pearly. Crystal System: 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 the Mohs scale. Color: Dark grey to black base with subtle iridescent schiller/labradorescence. Luster: Vitreous to pearly. Crystal System: Triclinic. Specific Gravity: 2.68-2.72.
Formation & geological history
Formed in mafic igneous rocks like basalt and gabbro, as well as anorthosites. Crystallizes slowly within magma cooling deep in the Earth's crust.
Uses & applications
Used widely for ornamental carvings, jewelry (cabochons, beads), decorative countertops, and as popular gemstones for mineral collectors.
Geological facts
Exhibits a unique optical phenomenon known as labradorescence, caused by internal light reflections off micro-lamellar intergrowths within the feldspar structure.
Field identification & locations
Commonly found in Canada (Labrador), Madagascar, Russia, Finland, and Norway. Identified in the field by its distinctive iridescent flash of color when rotated under direct light.
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