mineral

Sunstone

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

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Mohs), Color: Orange/Red/Peach with metallic inclusions, Luster: Vitreous to Pearly, Crystal structure: Triclinic, Specific Gravity: 2.62-2.65

Hardness: 6-6

Identified April 4, 2026More mineral →

Explore Sunstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-6.5 (Mohs), Color: Orange/Red/Peach with metallic inclusions, Luster: Vitreous to Pearly, Crystal structure: Triclinic, Specific Gravity: 2.62-2.65

Formation & geological history

Formed in cooling basaltic or andesitic lava flows. The internal schiller effect is caused by minute platelets of copper or hematite oriented within the crystal lattice during slow cooling.

Uses & applications

Primarily used as a semi-precious gemstone for jewelry (rings, pendants, earrings) and as a collector's mineral.

Geological facts

Oregon Sunstone contains unique copper inclusions and is the official state gemstone of Oregon. The optical effect seen in these stones is known as 'aventurescence'.

Field identification & locations

Identify by looking for the 'schiller effect', which appears as a metallic flash or glitter when the stone is tilted under light. Commonly found in Oregon (USA), Norway, Tanzania, and India.