mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
AI-generated identification · may be incorrectHardness: 6-6.5 on Mohs scale; Color: Reddish-brown, orange, or gold with a metallic shimmer; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.67
- Hardness
- 6-6
- Color
- Reddish-brown, orange, or gold with a metallic shimmer
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 on Mohs scale; Color: Reddish-brown, orange, or gold with a metallic shimmer; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.67
Formation & geological history
Forms in igneous rocks like basalt flows or pegmatites. The characteristic 'schiller' effect comes from tiny hematite or copper platelet inclusions reflecting light.
Uses & applications
Primarily used as a gemstone in jewelry (rings, pendants) and as a decorative collector mineral.
Geological facts
The optical phenomenon in sunstone, known as aventurescence, is caused by light reflecting off mineral inclusions. Some rare Oregon sunstones contain microscopic copper crystals instead of hematite.
Field identification & locations
Identify by its distinct metallic glitter against a feldspar base. Found commonly in Oregon (USA), Norway, Tanzania, and India. Look for flat cleavage planes and a warm orange-to-red hue.
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Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
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Granite
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Septarian Pebble
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