gemstone
Sunstone
Oligoclase feldspar (Na,Ca)(Al,Si)4O8
AI-generated identification · may be incorrectHardness 6-6.5 on the Mohs scale, reddish-orange to brown color, vitreous luster, triclinic crystal system, distinct cleavage, and a specific gravity of 2.62-2.65.
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Physical properties
Hardness 6-6.5 on the Mohs scale, reddish-orange to brown color, vitreous luster, triclinic crystal system, distinct cleavage, and a specific gravity of 2.62-2.65.
Formation & geological history
Forms in igneous rocks like basalt and granites, as well as metamorphic rocks, through the exsolution of copper platelets creating its signature aventurescence.
Uses & applications
Used primarily in high-end jewelry such as rings and pendants, and collected by mineral enthusiasts.
Geological facts
Sunstone is the state gemstone of Oregon, USA, where unique copper-bearing specimens are mined.
Field identification & locations
Easily identified by its characteristic metallic shimmer or glitter caused by tiny copper inclusions; found in the USA, Norway, and India.
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