mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, or gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.62-2.72. Features a unique schiller effect (aventurescence).

Hardness: 6-6
Color: Orange, reddish-brown, or gold
Luster: Vitreous to pearly

Identified May 23, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks such as basalt and andesite through the crystallization of lava. The metallic glitter is caused by tiny plate-like inclusions of copper or hematite oriented within the crystal lattice.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants, and beads) and as a collector's specimen. It is valued for its optical 'shimmer' or aventurescence.

Geological facts

Sunstone was once believed by various cultures to have mystical properties, including the ability to guide Viking navigators. The most famous varieties are Oregon Sunstone, which contains inclusions of elemental copper.

Field identification & locations

Identify in the field by its distinct metallic glitter when tilted in the light. It is commonly found in Oregon (USA), Norway, Greece, Tanzania, and India. Collectors look for high transparency and strong aventurescence.