mineral

Sunstone

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

Hardness (Mohs scale): 6 to 6.5; Color: Orange, red, golden, or pink with metallic inclusions; Luster: Vitreous to sub-vitreous with aventurescence; Crystal structure: Triclinic; Cleavage: Two perfect directions at nearly 90 degrees; Specific gravity: 2.62 to 2.65

Color: Orange, red, golden, or pink with metallic inclusions
Luster: Vitreous to sub-vitreous with aventurescence

Identified May 10, 2026More mineral →

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Physical properties

Formation & geological history

Formulated in igneous rocks such as basalt or andesite, often resulting from crystallization within lava flows. Inclusions of copper or hematite create the characteristic flash.

Uses & applications

Primarily used in jewelry as gemstones (cabochons or faceted stones) and as a collector's mineral specimen.

Geological facts

The metallic 'glitter' seen in Sunstone is called aventurescence. Oregon Sunstone is unique because it contains tiny flakes of copper rather than hematite, making it highly prized.

Field identification & locations

Look for a distinct metallic shimmer or 'schiller' effect when rotated under light. Often found in volcanic areas, particularly in Oregon, USA, India, and Norway.

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