mineral

Sunstone

Heliolite (Aventurine Feldspar, (Ca,Na)((Al,Si)2Si2O8))

AI-generated identification · may be incorrect

Hardness: 6-6.5 (Mohs); Color: Reddish-orange with metallic flashes; Luster: Vitreous to sub-metallic; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6-6
Color: Reddish-orange with metallic flashes
Luster: Vitreous to sub-metallic

Identified July 5, 2026More mineral →

Explore Sunstone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-6.5 (Mohs); Color: Reddish-orange with metallic flashes; Luster: Vitreous to sub-metallic; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Formation & geological history

Formed in igneous environments, particularly lavas like basalt. Its characteristic shimmer (aventurescence) is caused by tiny inclusions of copper or hematite plates. The coordinates 43.4N, 40E (Western Caucasus region) are geologically complex and include volcanic and metamorphic formations where feldspars are common.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons or beads) and as a metabolic or holistic stone in metaphysical circles.

Geological facts

The shimmering effect is called aventurescence. Some ancient cultures believed sunstones could navigate the seas by polarizing light, often associated with the 'Viking Sunstone' although that was likely calcite.

Field identification & locations

Identify in the field by its distinct metallic 'glitter' when rotated under light, a property called schiller. Common in Norway, India, and Oregon, USA.