mineral
Tumbled labradorite
Labradorite, Ca(Na,Ca)(Al,Si)₄O₈; plagioclase feldspar
AI-generated identification · may be incorrectGray-blue, polished, vitreous luster with possible blue-green iridescent flash (labradorescence); hardness 6–6.5 Mohs, triclinic crystals, two good cleavage directions, specific gravity about 2.68–2.72.
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Physical properties
Gray-blue, polished, vitreous luster with possible blue-green iridescent flash (labradorescence); hardness 6–6.5 Mohs, triclinic crystals, two good cleavage directions, specific gravity about 2.68–2.72.
Formation & geological history
Forms in mafic igneous rocks such as gabbro, norite, and anorthosite when feldspar-rich magma cools; most specimens formed in Precambrian to younger intrusive bodies. The image shows a human-tumbled and polished piece.
Uses & applications
Used as a decorative stone, lapidary material, cabochons, beads, and carvings; architectural labradorite is used occasionally for countertops and facing stone.
Geological facts
Its blue flash results from light interference between microscopic lamellae produced by exsolution within the feldspar crystal. Strong labradorescence generally increases desirability.
Field identification & locations
Identify by its cool gray body color, feldspar-like cleavage, moderate hardness, and blue or multicolor flash when tilted under a light. Common sources include Madagascar, Finland, Canada, Norway, and Russia.
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