mineral

Sunstone

Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, or translucent with gold/red sheen; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.62-2.67

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

Identified May 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, typically in basaltic lava flows or pegmatites. The characteristic 'shiller' effect is caused by tiny plate-like inclusions of hematite or copper reflecting light.

Uses & applications

Primarily used as a gemstone in jewelry (earrings, rings, pendants) and as a collector's mineral specimen.

Geological facts

Sunstone was once thought to be a compass by Vikings to find the sun through clouds. It is the official state gemstone of Oregon in the United States, where some of the most famous copper-bearing specimens are mined.

Field identification & locations

Identify by its 'aventurescence' (metallic glitter). Commonly found in Norway, India, Canada, and the USA (Oregon). Field identification involves checking for feldspar cleavage and the distinctive metallic glitter within the stone.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

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Epidote

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