mineral
Polished labradorite cabochon
Labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectLikely a smooth, polished cabochon showing subdued blue-green and bronze labradorescence. Hardness 6–6.5 Mohs; vitreous luster, triclinic crystals, two cleavages near 90°, specific gravity about 2.7.
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Physical properties
Likely a smooth, polished cabochon showing subdued blue-green and bronze labradorescence. Hardness 6–6.5 Mohs; vitreous luster, triclinic crystals, two cleavages near 90°, specific gravity about 2.7.
Formation & geological history
Forms in cooling mafic igneous rocks, especially gabbro and anorthosite; its age depends on the deposit. The color flashes arise from light interference within fine internal layers of feldspar.
Uses & applications
Used in cabochon jewelry, beads, ornaments, and decorative stonework.
Geological facts
Labradorescence is the characteristic shifting color effect, often strongest when the stone is viewed from particular angles.
Field identification & locations
Common sources include Labrador, Canada; Madagascar; Finland; and Norway. Identify it by rotating the polished surface under light for angular flashes; the dark appearance in this image limits certainty.
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