mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale; Color: Orange, gold, reddish-brown; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Features aventurescence (metallic schiller).

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

Identified May 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks like basalt or andesite through slow cooling of lava or magma, allowing for the inclusion of copper or hematite platelets that cause its sparkle.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons or faceted stones) and as a collector's mineral specimen. Often associated with metaphysical 'positive energy'.

Geological facts

The characteristic shimmer is called 'aventurescence,' which is caused by light reflecting off tiny inclusions of metallic minerals like copper or hematite. Oregon sunstone is unique for containing copper.

Field identification & locations

Identify in the field by its distinct flash (schiller) when rotated in light and crystal cleavage. Commonly found in Oregon (USA), Norway, Tanzania, and India.