mineral

Sunstone

Plagioclase Feldspar (Na,Ca)(Si,Al)3O8

Hardness: 6-6.5 on Mohs scale. Color: Peach, orange, pinkish, or reddish-brown with white mottling. Luster: Vitreous to pearly, with a distinct schiller effect (aventurescence). Cleavage: Perfect in two directions intersecting near 90 degrees. Specific gravity: 2.62–2.65.

Hardness: 6-6
Color: Peach, orange, pinkish, or reddish-brown with white mottling

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous and metamorphic geological environments, often crystallizing from cooling magma within basaltic lava flows or granitic pegmatites. The characteristic glitter comes from microscopic inclusions of hematite, copper, or goethite.

Uses & applications

Used widely as a gemstone for cabochons, beads, and carved jewelry. Highly prized by lapidary hobbyists and mineral collectors.

Geological facts

Sunstone exhibits a unique optical phenomenon called aventurescence, which is caused by tiny metallic inclusions reflecting light inside the stone. Oregon Sunstone, containing copper inclusions, is the official state gemstone of Oregon.

Field identification & locations

Identified by its distinctive salmon-pink to orange coloration, feldspar cleavage planes, and schiller/glitter effect under bright light. Commonly found in Oregon (USA), India, Canada, Madagascar, and Norway.