mineral

Sunstone

Orthoclase or Oligoclase Feldspar (Na,Ca)(Al,Si)4O8

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, yellow; Luster: Vitreous to pearly; Crystal structure: Triclinic or Monoclinic; Cleavage: Perfect in two directions; Aventurescence (glittering effect).

Hardness: 6-6
Color: Orange, reddish-brown, yellow
Luster: Vitreous to pearly

Identified April 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments, particularly in basaltic lava flows or pegmatites. The characteristic glitter comes from tiny inclusions of hematite, copper, or goethite that align during the cooling of the magma.

Uses & applications

Primarily used as a gemstone in jewelry (cabochons and faceted stones) and as a collector's mineral specimen. Some varieties are used in decorative carvings.

Geological facts

The glittery effect is known as 'schiller' or 'aventurescence'. Oregon sunstone is unique because it contains microscopic inclusions of solid copper, which produces a distinct reddish glow.

Field identification & locations

Identify in the field by its distinct metallic-like glitter when rotated under a light source and its characteristic feldspar cleavage planes. Commonly found in Oregon (USA), Norway, Tanzania, and India.

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