mineral

Sunstone (Feldspar variety)

Plagioclase Feldspar (Na,Ca)(Si,Al)3O8 with Hematite/Goethite inclusions

Hardness: 6.0-6.5 on the Mohs scale. Color: Reddish-brown, orange-red, or pinkish with shiny, reflective metallic inclusions. Luster: Vitreous to pearly, featuring aventurescence (a metallic glitter). Crystal Structure: Triclinic. Specific Gravity: 2.62-2.65.

Hardness: 6

Identified July 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments within cooling magma bodies, specifically basaltic lava flows or pegmatites, where copper or hematite micro-inclusions crystallize within the feldspar matrix.

Uses & applications

Used primarily as a gemstone in jewelry (cabochons, beads, faceted stones) and highly prized as a lapidary and mineral collector's specimen.

Geological facts

The glittering optical effect is known as aventurescence or 'schiller', caused by light reflecting off tiny platelets of hematite, copper, or goethite embedded inside the mineral. Oregon Sunstone, which contains natural copper inclusions, is the official state gemstone of Oregon.

Field identification & locations

Identified in the field by its distinct reddish-orange hue, feldspar cleavage planes, and metallic sparkling flashes under direct sunlight. Commonly found in Oregon (USA), India, Norway, Canada, and Madagascar.

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