mineral

Sunstone

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

Hardness: 6.0-6.5 (Mohs scale); Color: Orange, reddish-brown, or peach with gold/red inclusions; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.62-2.67.

Hardness: 6
Color: Orange, reddish-brown, or peach with gold/red inclusions
Luster: Vitreous to pearly

Identified March 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, typically within basaltic lava flows or granitic pegmatites. The metallic 'shiller' effect (aventurescence) is caused by tiny inclusions of copper or hematite plates reflecting light.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants, earrings) and as a collector's mineral specimen. Some lower-grade material is used for decorative carvings.

Geological facts

Oregon sunstone is a rare variety that contains tiny platelets of copper, unique to that region. Viking legends suggest sunstone (likely a different optical mineral like cordierite or calcite, though some debate sunstone) was used as a 'sun-compass' for navigation.

Field identification & locations

Identify by its distinctive 'aventurescence' (metallic glitter) when rotated under light. Commonly found in Oregon (USA), Norway, India, and Tanzania. Collectors look for clarity and high inclusion density.

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