mineral
Blue labradorite (likely)
Labradorite, a calcium-rich plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectGray-blue, partly translucent stone with blue iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystals, two good cleavage directions, and Mohs hardness 6–6.5; specific gravity about 2.68–2.72.
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Physical properties
Gray-blue, partly translucent stone with blue iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystals, two good cleavage directions, and Mohs hardness 6–6.5; specific gravity about 2.68–2.72.
Formation & geological history
Forms in slowly cooled mafic igneous rocks such as basalt, gabbro, and anorthosite through crystallization of feldspar-rich magma, commonly in Precambrian terrains.
Uses & applications
Used as ornamental stone, cabochons, beads, carvings, countertops, and mineral specimens; attractive blue flash increases jewelry and collector value.
Geological facts
Its color play results from light interference in microscopic exsolution layers within the feldspar, not from surface coating or dye.
Field identification & locations
Commonly found in Madagascar, Finland, Canada, Norway, Russia, and the United States. Confirm by rotating it under directional light: genuine labradorescence shifts with angle; it should also show feldspar cleavage and resist a steel knife.
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