mineral

Sunstone (Feldspar)

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

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs. Color: Orange, reddish-brown, or peach with metallic flashes. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly 90 degrees.

Hardness: 6-6
Color: Orange, reddish-brown, or peach with metallic flashes
Luster: Vitreous to pearly

Identified July 5, 2026More mineral →

Explore Sunstone (Feldspar) 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: Orange, reddish-brown, or peach with metallic flashes. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly 90 degrees.

Formation & geological history

Forms in igneous rocks like basalt and andesite, and occasionally in metamorphic environments. Its signature shimmer (schiller) is caused by tiny inclusions of copper, hematite, or goethite.

Uses & applications

Primarily used as a gemstone in jewelry, including rings, pendants, and beads. Also valued as a metaphysical stone and collector's specimen.

Geological facts

The 'schiller' effect or aventurescence in Oregon sunstone is caused by microscopic inclusions of native copper. It was named the state gemstone of Oregon in 1987.

Field identification & locations

Identified by its warm orange hue and internal metallic glints. Found commonly in Oregon (USA), Norway, Tanzania, and India. Look for flat cleavage planes and a characteristic glitter when tilted.