mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Hardness: 6-6.5 (Mohs scale), Color: Gray-green to dark gray with labradorescence (schiller effect), Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions.
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Gray-green to dark gray with labradorescence (schiller effect), Luster: Vitreous to pearly, Crystal Structure: Triclinic, Cleavage: Perfect in two directions.
Formation & geological history
Formed in mafic igneous rocks such as basalt and gabbro through the crystallization of magma; also found in some metamorphic rocks and anorthosites.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a high-end architectural stone for countertops and tiles.
Geological facts
Labradorite is famous for its optical effect known as labradorescence, which is caused by internal light reflections from submicroscopic layers of exsolution lamellae.
Field identification & locations
Identify by rotating the stone in light to catch the 'flash' of blue, green, or gold. Commonly found in Labrador (Canada), Madagascar, Finland, and Russia.
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