mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
Mohs hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Notable for labradorescence (iridescent play of colors).
- Hardness
- 6-6
- Color
- Gray-green to dark gray
- Luster
- Vitreous to pearly
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Physical properties
Mohs hardness: 6-6.5; Color: Gray-green to dark gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Notable for labradorescence (iridescent play of colors).
Formation & geological history
Plagioclase feldspar that forms in mafic igneous rocks like basalt and norite, as well as in anorthosites. It results from the crystallization of magma.
Uses & applications
Frequently used as a gemstone in necklaces and rings, for ornamental carvings, and high-end architectural countertops.
Geological facts
The iridescent effect known as labradorescence is caused by light reflecting off sub-microscopic layers of exsolution lamellae within the crystal.
Field identification & locations
Identify in the field by rotating the specimen in light to see the blue, gold, or green flashes. It is commonly found in Canada (Labrador), Madagascar, and Finland.
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Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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Schist
Schist
Metamorphic
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
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Mineral/Rock