mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale; Color: Reddish-brown, orange, or gold with a metallic shimmer; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.67

Hardness: 6-6
Color: Reddish-brown, orange, or gold with a metallic shimmer
Luster: Vitreous to pearly

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms in igneous rocks like basalt flows or pegmatites. The characteristic 'schiller' effect comes from tiny hematite or copper platelet inclusions reflecting light.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants) and as a decorative collector mineral.

Geological facts

The optical phenomenon in sunstone, known as aventurescence, is caused by light reflecting off mineral inclusions. Some rare Oregon sunstones contain microscopic copper crystals instead of hematite.

Field identification & locations

Identify by its distinct metallic glitter against a feldspar base. Found commonly in Oregon (USA), Norway, Tanzania, and India. Look for flat cleavage planes and a warm orange-to-red hue.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Biotite Schist

Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]

metamorphic