mineral

Sunstone

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

Hardness: 6-6.5 (Mohs scale); Color: Orange, reddish-brown, or peach; Luster: Vitreous to sub-metallic; Crystal Structure: Triclinic; Cleavage: Perfect in two directions at nearly 90 degrees; Specific Gravity: 2.62-2.67

Hardness: 6-6
Color: Orange, reddish-brown, or peach
Luster: Vitreous to sub-metallic

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous or metamorphic environments, often found in lava flows or pegmatites. The characteristic glitter (aventurescence) is caused by tiny inclusions of hematite or copper particles that crystallized during cooling.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads, and facets) and is highly valued by mineral collectors for its unique optical effects.

Geological facts

Sunstone is the official state gemstone of Oregon. The glistening effect seen in the stone is specifically known as 'aventurescence,' caused by microscopic plate-like inclusions.

Field identification & locations

Identify by rotating under light to see internal metallic flashes. Commonly found in Oregon (USA), Norway, Tanzania, India, and Russia. Collectors look for high clarity and intense flashes of color.