mineral
Labradorite
(Ca,Na)(Al,Si)4O8 (Sodic-calcic plagioclase feldspar)
Hardness: 6.0-6.5; Color: Dark grey to black base with iridescent schiller; Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific Gravity: 2.68-2.72
- Hardness
- 6
- Color
- Dark grey to black base with iridescent schiller
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6.0-6.5; Color: Dark grey to black base with iridescent schiller; Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific Gravity: 2.68-2.72
Formation & geological history
Formed in mafic igneous rocks through slow cooling and crystallization, often found in anorthosite. Showcases exsolution lamellae that cause labradorescence.
Uses & applications
Primarily used as a gemstone for jewelry, ornamental carvings, and decorative architectural stone slabs.
Geological facts
The 'flash' or play of color visible in labradorite is called labradorescence, caused by light diffracting between thin layers of different feldspar minerals.
Field identification & locations
Identified by tilting the specimen to catch the light, revealing hidden flashes of blue, green, or gold. Commonly found in Canada (Labrador), Madagascar, and Finland.
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Other mineral specimens
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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