mineral
Labradorite (Schiller Spar)
(Na,Ca)(Al,Si)4O8
Hardness: 6-6.5; Color: Grey to smoke-black; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72
- Hardness
- 6-6
- Color
- Grey to smoke-black
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5; Color: Grey to smoke-black; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.68-2.72
Formation & geological history
Formed in mafic igneous rocks like basalt and gabbro. It crystallizes from cooling magma and exhibits an internal lamellar structure that causes light interference (labradorescence).
Uses & applications
Used primarily in jewelry (cabochons), as an ornamental stone for countertops and architectural cladding, and popular among gemstone collectors.
Geological facts
Named after the Labrador peninsula in Canada where it was discovered in 1770. The vibrant play of color it displays is caused by light reflecting off microscopic layers of different mineral compositions.
Field identification & locations
Identify in the field by its distinctive 'flash' of blue, green, or gold colors when tilted in light. Found commonly in Canada, Madagascar, Norway, and Russia.
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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