mineral
Labradorite (Gray Moonlight variation)
(Ca, Na)(Al, Si)4O8
Hardness: 6-6.5 (Mohs scale); Color: Gray, grayish-green, or brownish-gray; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions.
- Hardness
- 6-6
- Color
- Gray, grayish-green, or brownish-gray
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Mohs scale); Color: Gray, grayish-green, or brownish-gray; 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, often occurring in large plutonic masses. Known for its distinctive labradorescence caused by internal lamellar twinning.
Uses & applications
Primarily used as a gemstone in necklaces, bracelets, and rings; also used in decor such as countertops and tiles.
Geological facts
It is named after the Labrador peninsula in Canada where it was first discovered in 1770. The vibrant play of color known as 'labradorescence' is light reflecting off intergrowths within the stone.
Field identification & locations
Identify by its characteristic gray body color and flashes of blue, gold, or green when tilted in light. Found commonly in Canada, Madagascar, and Norway.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous