metamorphic
Polished labradorite gemstone
Labradorite, plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
AI-generated identification · may be incorrectTypically gray to blue-gray with strong iridescent labradorescence, glassy to pearly luster, Mohs hardness 6–6.5, and two good cleavage directions. The image appears to show a cut or polished specimen with angular reflective facets.
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Physical properties
Typically gray to blue-gray with strong iridescent labradorescence, glassy to pearly luster, Mohs hardness 6–6.5, and two good cleavage directions. The image appears to show a cut or polished specimen with angular reflective facets.
Formation & geological history
Labradorite crystallizes in mafic igneous rocks such as gabbro and anorthosite during cooling of magma; it is commonly Precambrian to younger. Its color flashes result from light interference within fine feldspar lamellae.
Uses & applications
Used for cabochons, carvings, ornamental slabs, countertops, and mineral collecting; faceted stones are less common because cleavage can complicate cutting.
Geological facts
Its blue, green, gold, or multicolor flash is called labradorescence, not ordinary surface glitter. Quality depends primarily on flash intensity, coverage, and body color.
Field identification & locations
Identify it by gray feldspar body color, prominent blue-green flashes when tilted, hardness around 6, and cleavage; common sources include Labrador, Canada, Madagascar, Finland, Norway, and Russia.
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