mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)4O8
AI-generated identification · may be incorrectHardness: 6-6.5 on Mohs scale; Color: Orange, gold, reddish-brown; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Features aventurescence (metallic schiller).
- Hardness
- 6-6
- Color
- Orange, gold, reddish-brown
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Orange, gold, reddish-brown; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Features aventurescence (metallic schiller).
Formation & geological history
Formed in igneous rocks like basalt or andesite through slow cooling of lava or magma, allowing for the inclusion of copper or hematite platelets that cause its sparkle.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons or faceted stones) and as a collector's mineral specimen. Often associated with metaphysical 'positive energy'.
Geological facts
The characteristic shimmer is called 'aventurescence,' which is caused by light reflecting off tiny inclusions of metallic minerals like copper or hematite. Oregon sunstone is unique for containing copper.
Field identification & locations
Identify in the field by its distinct flash (schiller) when rotated in light and crystal cleavage. Commonly found in Oregon (USA), Norway, Tanzania, and India.
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