mineral

Sunstone

Oligoclase (Plagioclase Feldspar) - (Ca, Na)(Al, Si)4O8

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale; Color: Orange, red, or gold with metallic flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.67

Hardness: 6-6
Color: Orange, red, or gold with metallic flashes
Luster: Vitreous to pearly

Identified March 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, typically within basaltic or andesitic lava flows. The unique shimmering effect (schiller) is caused by inclusions of copper or hematite plates that align during cooling.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants, earrings), and as a decorative stone for collectors and metaphysical practitioners.

Geological facts

Oregon Sunstone is the official state gemstone of Oregon and is unique because its glittery aventurescence is caused by tiny inclusions of native copper rather than hematite.

Field identification & locations

Identify in the field by its distinct metallic 'glitter' or flash (aventurescence) when rotated under light. Commonly found in Oregon (USA), Norway, Tanzania, and India. Collectors should look for clean transparency and strong color saturation.