mineral
Labradorite (polished mineral specimen)
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectHardness 6–6.5 Mohs; typically gray to dark gray with a vitreous luster and triclinic crystals. The image shows a polished, elongated piece with a pale cut end; characteristic blue-green iridescence is not clearly visible.
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Physical properties
Hardness 6–6.5 Mohs; typically gray to dark gray with a vitreous luster and triclinic crystals. The image shows a polished, elongated piece with a pale cut end; characteristic blue-green iridescence is not clearly visible.
Formation & geological history
Forms in slowly cooled, calcium-rich igneous rocks such as gabbro and anorthosite; many deposits are Precambrian, though the specimen’s age and source cannot be determined from the image.
Uses & applications
Used as an ornamental stone, in jewelry and carvings, and as a feldspar resource in ceramics and glass.
Geological facts
Its shifting flashes of color, called labradorescence, arise from light interference within microscopic feldspar layers.
Field identification & locations
Identify by its feldspar hardness, two cleavage directions near 90°, and—when present—colorful flashes when tilted. Notable sources include Labrador, Canada, Madagascar, Finland, and Norway.
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