mineral

Sunstone (Oregon Sunstone)

Labradorite (Feldspar variety) - (Ca, Na)(Al, Si)4O8

Hardness: 6.0-6.5 (Mohs scale); Color: Pale yellow to transparent honey; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.72.

Hardness: 6
Color: Pale yellow to transparent honey
Luster: Vitreous to pearly

Identified March 25, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5 (Mohs scale); Color: Pale yellow to transparent honey; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.72.

Formation & geological history

Formed in volcanic lava flows, specifically basalt. The copper-bearing variety found in Oregon is approximately 13 to 17 million years old, crystallized within the porphyritic basalt of the Steens Mountain volcanic event.

Uses & applications

Primary use is in jewelry as gemstones (faceted or cabochons) and as a highly sought-after specimen for mineral collectors.

Geological facts

Oregon sunstone is unique because it contains microscopic inclusions of metallic copper, which creates a 'schiller' effect (aventurescence). It was named the official state gemstone of Oregon in 1987.

Field identification & locations

Identify in the field by its distinct cleavage planes and translucent honey-yellow color. It is commonly found in the high desert of Lake County, Oregon; specifically the Plush and Rabbit Hills areas. Collectors should look for flashes of color when held to the light.

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