mineral

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Hardness: 6-7 Mohs; Color: Pale yellow to reddish-orange; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.62-2.67

Hardness: 6-7 Mohs
Color: Pale yellow to reddish-orange
Luster: Vitreous to pearly

Identified March 14, 2026More mineral →

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Physical properties

Hardness: 6-7 Mohs; Color: Pale yellow to reddish-orange; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.62-2.67

Formation & geological history

Formed in igneous or metamorphic rocks as molten rock cools. The distinctive orange/yellow color and metallic shimmer (schiller effect) are caused by inclusions of copper or hematite crystals. Common in volcanic flows and pegmatite veins.

Uses & applications

Primary use is in the jewelry industry as a decorative gemstone. It is often cut into cabochons or faceted. Collectors value it for its unique optical properties.

Geological facts

Oregon is the most famous source for a specific variety known as 'Oregon Sunstone,' which is unique for containing tiny platelets of native copper. It was named the official state gemstone of Oregon in 1987.

Field identification & locations

Identify in the field by its blocky cleavage, waxy to glassy appearance, and 'schiller' effect (a distinct flash of light when rotated). Common locations include Oregon (USA), Norway, India, and Tanzania.

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