mineral
Polished labradorite fish carving
Labradorite, a calcium-sodium feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectHardness 6–6.5 Mohs; gray to brown body color with blue-green iridescent labradorescence, vitreous luster, triclinic crystal structure, and two good cleavage directions. The shape is human-carved and polished, so its surface properties differ from a raw specimen.
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Physical properties
Hardness 6–6.5 Mohs; gray to brown body color with blue-green iridescent labradorescence, vitreous luster, triclinic crystal structure, and two good cleavage directions. The shape is human-carved and polished, so its surface properties differ from a raw specimen.
Formation & geological history
Labradorite crystallizes in slowly cooled mafic igneous rocks such as anorthosite, gabbro, and basalt, generally from Precambrian to younger intrusive settings. The flashes arise from microscopic intergrowths within the feldspar that produce light interference.
Uses & applications
Used as ornamental stone, cabochons, beads, carvings, and interior facing; this example is primarily decorative or collectible.
Geological facts
Its blue, green, gold, or multicolor flash is called labradorescence, not ordinary surface iridescence. Strong flash is best seen by rotating the polished piece under directional light.
Field identification & locations
Common sources include Labrador and Newfoundland, Canada; Finland, Madagascar, Norway, and Russia. Identify it by gray feldspar body color, cleavage, moderate hardness, and shifting spectral flashes; a steel knife should not scratch it easily.