mineral
Raw Sunstone
Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))
Hardness: 6-6.5 (Mohs), Color: Orange-brown with metallic 'schiller' flash, Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific gravity: 2.62-2.67
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Orange-brown with metallic 'schiller' flash, Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific gravity: 2.62-2.67
Formation & geological history
Forms in igneous rocks like basalt or rhyolite and in pegmatites. The aventurescence is caused by tiny inclusions of copper or hematite plates. Significant deposits range from Cenozoic to older geological periods.
Uses & applications
Primarily used as a gemstone in jewelry (cabochons, beads, or faceted stones) and as a collector's mineral specimen.
Geological facts
Oregon Sunstone is the official state gemstone of Oregon, USA, and is unique because its metallic 'schiller' effect is caused by inclusions of pure copper.
Field identification & locations
Identify in the field by its distinct orange-to-gold metallic shimmer when tilted under light. Found in Oregon (USA), Norway, India, and Tanzania. Look for it in weathered basaltic flows.
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