mineral

Sunstone

Plagioclase Feldspar (Na, Ca)(Al, Si)4O8 with Hematite or Copper inclusions

Hardness: 6–6.5 (Mohs scale); Color: Orange, gold, reddish-brown with colorless or yellow matrix; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Special Property: Aventurescence (shiller effect).

Hardness: 6–6
Color: Orange, gold, reddish-brown with colorless or yellow matrix
Luster: Vitreous to pearly

Identified March 9, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, typically in flows of basalt or within large pegmatite veins. The distinctive 'sun' effect is caused by tiny plate-like inclusions of copper or hematite reflecting light as the mineral crystallizes from cooling magma.

Uses & applications

Primary use is in the jewelry industry where it is cut into cabochons or faceted stones. It is also a popular specimen for crystal healing practitioners and mineral collectors.

Geological facts

Oregon is famous for producing high-quality Sunstone containing copper inclusions, leading it to be named the official state gemstone in 1987. Historically, some believe it was the 'Viking Sunstone' used for navigation, though Calcite is a more likely candidate for that specific legend.

Field identification & locations

Identify in the field by looking for a 'glitter' or metallic shimmer (aventurescence) when rotating the stone under direct light. It is commonly found in Oregon (USA), Norway, Tanzania, and India. Collectors look for high transparency and strong 'shiller' flash.

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