mineral

Sunstone

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

Hardness: 6-6.5; Color: Orange, reddish-brown, or gold with metallic flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.62-2.65

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

Identified March 17, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous rocks like basalt or rhyolite, and in pegmatites. The metallic 'schiller' effect or aventurescence is caused by tiny inclusions of copper, hematite, or goethite. Ages vary by location, often associated with Cenozoic volcanic flows.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons or faceted stones) and for lapidary carving. It is popular among crystal collectors for its unique optical properties.

Geological facts

Sunstone is the official state gemstone of Oregon, USA. The 'schiller' effect seen in these stones is a result of light reflecting off microscopic copper or hematite platelets embedded within the feldspar lattice.

Field identification & locations

Identify in the field by its distinct orange-to-pink coloration and the presence of glittering metallic reflections when tilted under light. High-quality specimens are frequently found in Oregon, Norway, India, and Tanzania.

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

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)

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Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

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Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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