mineral
Sunstone
Oligoclase (Feldspar variety)
Hardness: 6-6.5 Mohs scale; Color: Orange, reddish-brown, or gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Features aventurescence (shiller effect).
- Hardness
- 6-6
- Color
- Orange, reddish-brown, or gold
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs scale; Color: Orange, reddish-brown, or gold; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Features aventurescence (shiller effect).
Formation & geological history
Formed in igneous rocks like basalt or andesite flows, and also in pegmatites. The specific optical effects are caused by tiny inclusions of copper or hematite plates during cooling.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads, and facets) and is a popular specimen for mineral collectors.
Geological facts
Oregon Sunstone is unique because its glittery aventurescence is caused by microscopic inclusions of native copper rather than hematite or goethite.
Field identification & locations
Identify by its characteristic metallic-looking glitter or 'shiller' effect when rotated under light. Found in Oregon (USA), Norway, Tanzania, and India.
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