mineral
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Hardness: 6-6.5 Mohs. Color: Orange, reddish-brown, or peach with metallic flashes. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly 90 degrees.
- Hardness
- 6-6
- Color
- Orange, reddish-brown, or peach with metallic flashes
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs. Color: Orange, reddish-brown, or peach with metallic flashes. Luster: Vitreous to pearly. Crystal structure: Triclinic. Cleavage: Perfect in two directions at nearly 90 degrees.
Formation & geological history
Forms in igneous rocks like basalt and andesite, and occasionally in metamorphic environments. Its signature shimmer (schiller) is caused by tiny inclusions of copper, hematite, or goethite.
Uses & applications
Primarily used as a gemstone in jewelry, including rings, pendants, and beads. Also valued as a metaphysical stone and collector's specimen.
Geological facts
The 'schiller' effect or aventurescence in Oregon sunstone is caused by microscopic inclusions of native copper. It was named the state gemstone of Oregon in 1987.
Field identification & locations
Identified by its warm orange hue and internal metallic glints. Found commonly in Oregon (USA), Norway, Tanzania, and India. Look for flat cleavage planes and a characteristic glitter when tilted.
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