mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale. Color: Peach, orange, or reddish-brown. Luster: Vitreous to pearly with adventurescence. Crystal structure: Triclinic. Cleavage: Perfect in two directions.

Hardness: 6-6
Color: Peach, orange, or reddish-brown
Luster: Vitreous to pearly with adventurescence

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 6-6.5 on Mohs scale. Color: Peach, orange, or reddish-brown. Luster: Vitreous to pearly with adventurescence. Crystal structure: Triclinic. Cleavage: Perfect in two directions.

Formation & geological history

Formed in molten lava (basaltic) and discharged through volcanoes. The distinct metallic glitter is caused by inclusions of hematite or copper crystals as the magma cools and crystallizes.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants) and as a decorative stone for spheres and carvings. It is popular in crystal healing circles.

Geological facts

The metallic sheen is a phenomenon called 'aventurescence'. It is the official state gemstone of Oregon in the United States, where some of the world's most valuable copper-bearing specimens are found.

Field identification & locations

Identify by its unique 'shiller' or metallic flash when rotated under light. Look for peach to salmon-pink body colors with small reflective flakes. Common in Oregon (USA), Norway, Tanzania, and India.