mineral
Labradorite (Polished Sphere)
Labradorite ((Ca, Na)(Al, Si)4O8)
Hardness: 6-6.5 on Mohs scale; Color: Dark grey to black base with iridescent flashes of blue, green, and gold (labradorescence); Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific gravity: 2.68-2.72.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Dark grey to black base with iridescent flashes of blue, green, and gold (labradorescence); Luster: Vitreous to pearly; Crystal structure: Triclinic; Specific gravity: 2.68-2.72.
Formation & geological history
Forms in mafic igneous rocks such as basalt and gabbro, and also in some metamorphic rocks and anorthosites. It is often found in plutonic environments and is commonly dated to the Precambrian or later eras.
Uses & applications
Primarily used in jewelry, ornamental carvings, polished decorative items like spheres, and sometimes as an architectural material (countertops or tiles).
Geological facts
The unique play of color is known as 'labradorescence,' caused by light reflecting off microscopic layers within the feldspar crystals. It was first discovered in Labrador, Canada, in 1770.
Field identification & locations
Identify in the field by its dark body color and 'hidden' iridescent flashes when tilted in the light. Major deposits are found in Canada (Labrador), Madagascar, Finland, and Russia.
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