mineral

Sunstone

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

Hardness: 6-6.5 (Mohs scale); Color: Orange, red, or gold with a metallic shimmer; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.72.

Hardness: 6-6
Color: Orange, red, or gold with a metallic shimmer
Luster: Vitreous to pearly

Identified April 12, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous or metamorphic environments, often found in basalt flows or pegmatites. The distinct shimmer (aventurescence) is caused by tiny inclusions of copper or hematite plates that reflect light.

Uses & applications

Primarily used as a gemstone for jewelry (rings, pendants, earrings) and as a collector's mineral specimen. In some cultures, it is used for metaphysical purposes.

Geological facts

Oregon in the USA is famous for producing unique copper-bearing sunstones. It is the official state gemstone of Oregon. The metallic effect is so specific it is known as 'aventurescence'.

Field identification & locations

Identify by looking for the 'schiller' effect—a glittery reflection when the stone is turned under light. Commonly found in Oregon (USA), Norway, India, and Tanzania. Field identification relies on hardness and the presence of these metallic-looking inclusions.