mineral
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Hardness: 6-6.5 Mohs; Color: Orange, reddish-brown with metallic 'shiller' or aventurescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.72.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs; Color: Orange, reddish-brown with metallic 'shiller' or aventurescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.72.
Formation & geological history
Formed in cooling magma (igneous) or deep metamorphic environments. The characteristic orange color and glitter are often caused by tiny inclusions of copper or hematite plates during the crystallization process.
Uses & applications
Primarily used as a gemstone in jewelry (rings, pendants) and by mineral collectors for its unique optical properties.
Geological facts
The shimmering effect is known as aventurescence. Oregon Sunstone is a unique variety that contains tiny flakes of copper and is the official state gemstone of Oregon, USA.
Field identification & locations
Identify in the field by its distinct orange hue and spangled metallic reflections when rotated under light. Commonly found in basalt flows (Oregon) or pegmatites (Norway and India).
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