gemstone

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Hardness: 6-6.5 Mohs scale. Color: Peach, pink, orange, or reddish-brown with internal metallic glitters. Luster: Vitreous to pearly. Crystal Structure: Triclinic. Cleavage: Perfect in two directions. Specific Gravity: 2.62-2.67.

Hardness: 6-6
Luster: Vitreous to pearly

Identified July 19, 2026More gemstone →

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Physical properties

Formation & geological history

Formed in igneous environments, specifically molten lava flows or plutonic igneous rocks. The metallic effect (aventurescence) is caused by tiny inclusions of copper, hematite, or goethite. Major deposits are found in Oregon (USA), Norway, and India.

Uses & applications

Used primarily as a gemstone in jewelry (cabochons, beads, faceted stones) and as a collector's mineral specimen.

Geological facts

Oregon Sunstone is the official state gemstone of Oregon. It is one of the few gemstones that can contain inclusions of pure metallic copper, creating a unique play of light known as the Schiller effect.

Field identification & locations

Identify by its characteristic peach-to-pink color and the presence of sparkling metallic inclusions under bright light. In the field, look for volcanic basalt host rocks or weathered alluvial deposits in high-desert regions.