mineral
Polished labradorite cabochon
Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈
AI-generated identification · may be incorrectHardness 6–6.5 Mohs; gray-green to yellow with a glassy luster and possible blue-green iridescence (labradorescence). Triclinic crystal structure and two cleavage directions; the image shows a polished, shaped stone.
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Physical properties
Hardness 6–6.5 Mohs; gray-green to yellow with a glassy luster and possible blue-green iridescence (labradorescence). Triclinic crystal structure and two cleavage directions; the image shows a polished, shaped stone.
Formation & geological history
Forms as calcium-rich plagioclase in cooling igneous rocks, especially gabbro and anorthosite. Deposits range from Precambrian to younger ages; its color effects arise from light interference in fine internal layers.
Uses & applications
Used in cabochon jewelry, ornamental objects, and as a decorative facing stone; this small polished specimen is primarily for jewelry or collecting.
Geological facts
Labradorescence is produced by light reflecting from microscopic compositional layers inside the feldspar.
Field identification & locations
Common sources include Labrador, Canada; Finland; Madagascar; and Norway. Identify it by its feldspar-like hardness and internal flashes of color, which are most visible when tilted under light.
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