mineral

Sunstone

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

Hardness: 6.0-6.5; Color: Orange, reddish-brown, or yellow; 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 yellow
Luster: Vitreous to pearly

Identified May 16, 2026More mineral →

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Physical properties

Hardness: 6.0-6.5; Color: Orange, reddish-brown, or yellow; 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 environments, typically within magmatic rocks like basalt or andesite, and occasionally in pegmatites. The distinct shimmer, or aventurescence, is caused by tiny plate-like inclusions of hematite or copper that reflect light.

Uses & applications

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

Geological facts

Sunstone was once thought to be a compass by Vikings to find the sun through cloudy skies. It is the official state gemstone of Oregon, USA, which is famous for producing high-quality specimens containing native copper inclusions.

Field identification & locations

Identify in the field by its distinct metallic shimmer (aventurescence) when rotated in light and its blocky cleavage typical of feldspars. Commonly found in Oregon (USA), Norway, Tanzania, and India.

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