mineral
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
AI-generated identification · may be incorrectHardness: 6-6.5; Color: Orange, reddish-brown with gold/copper metallic flashes (schiller); Luster: Vitreous; Crystal structure: Triclinic; Cleavage: Perfect in two directions.
- Hardness
- 6-6
- Luster
- Vitreous
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Physical properties
Hardness: 6-6.5; Color: Orange, reddish-brown with gold/copper metallic flashes (schiller); Luster: Vitreous; Crystal structure: Triclinic; Cleavage: Perfect in two directions.
Formation & geological history
Formed in lava flows as phenocrysts. The characteristic 'sun' effect is caused by tiny inclusions of copper or hematite, often found in basaltic rocks.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons or faceted stones) and as a lapidary material for collectors.
Geological facts
Sunstone is the official state gemstone of Oregon. The metallic iridescent flash seen when light hits it is known as aventurescence.
Field identification & locations
Identify in the field by its distinctive warm orange color and golden metallic glitter. Large deposits are found in Oregon (USA), Norway, and India.
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Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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