mineral
Tumbled labradorite beads
Labradorite, a calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)
AI-generated identification · may be incorrectTypically gray to dark gray with blue-green iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystals, and two good cleavage directions; Mohs hardness 6–6.5, specific gravity about 2.68–2.72. The beads are polished and perforated, so natural crystal faces and cleavage are not visible.
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Physical properties
Typically gray to dark gray with blue-green iridescent flashes (labradorescence), vitreous to pearly luster, triclinic crystals, and two good cleavage directions; Mohs hardness 6–6.5, specific gravity about 2.68–2.72. The beads are polished and perforated, so natural crystal faces and cleavage are not visible.
Formation & geological history
Forms mainly in mafic igneous rocks such as anorthosite, gabbro, and basalt as magma cools; many gem-quality deposits are Precambrian, especially in Madagascar, Finland, Canada, and Norway. Iridescence results from light interference in microscopic lamellar feldspar layers.
Uses & applications
Used for cabochons, beads, carvings, decorative objects, and collector specimens; it is not generally used as a major construction stone. Jewelry value depends strongly on the intensity, color, and coverage of the flash.
Geological facts
Labradorescence is an optical effect rather than surface glitter and is best seen by rotating the stone under directional light. The dark gray body color and blue-green flashes in the image are characteristic, though some beads may be mixed feldspar or treated material.
Field identification & locations
Identify by gray body color, moderate hardness, feldspar-like cleavage, and strong directional blue-green flashes; avoid confusing it with moonstone or synthetic glass. Common sources include Madagascar, Canada, Finland, Norway, and Russia.
