mineral

Raw Sunstone

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

AI-generated identification · may be incorrect

Hardness: 6-6.5 on Mohs scale; Color: Reddish-orange, pink, or brownish with white/clear areas; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.67

Hardness: 6-6
Color: Reddish-orange, pink, or brownish with white/clear areas
Luster: Vitreous to pearly

Identified July 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous rocks like basalt and andesite, often as phenocrysts. The red/orange coloring is caused by tiny inclusions of hematite or copper (schiller effect) and typically forms in volcanic lava flows.

Uses & applications

Used primarily as a gemstone for jewelry (cabochons, beads, faceted stones) and as a collector's specimen. Known for its 'aventurescence' or metallic glitter.

Geological facts

Sunstone is the official state gemstone of Oregon in the USA. While most sunstone contains hematite, the rare Oregon variety contains inclusions of pure copper.

Field identification & locations

Identify by its characteristic metallic glitter (schiller) when rotated under light and its pinkish-orange hue contrasted against lighter feldspar. Commonly found in Oregon (USA), Norway, Tanzania, and India.