mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, or peach with metallic flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Schiller effect (aventurescence).

Hardness: 6-6
Color: Orange, reddish-brown, or peach with metallic flashes
Luster: Vitreous to pearly

Identified January 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, typically in basaltic lava flows or pegmatites. The metallic glitter is caused by tiny inclusions of copper or hematite plates that reflect light as the mineral cools.

Uses & applications

Primarily used in jewelry as cabochons or faceted stones; also a popular mineral for metaphysical collecting and decorative carvings.

Geological facts

Oregon Sunstone is the official state gemstone of Oregon and is unique for containing microscopic copper inclusions that create a wide range of colors from clear to deep red and green.

Field identification & locations

Identify by the characteristic 'schiller' or 'aventurescence'—the metallic glitter seen when turning the stone. It is commonly found in India, Norway, Canada, and the United States (Oregon).