mineral
Sunstone
Aventurine Feldspar (Plagioclase or Oligoclase)
Hardness: 6.0-6.5; Color: Orange, reddish-brown, yellow; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.65
- Hardness
- 6
- Color
- Orange, reddish-brown, yellow
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6.0-6.5; Color: Orange, reddish-brown, yellow; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific gravity: 2.62-2.65
Formation & geological history
Forms in igneous rocks like basalt and metamorphic environments. The color and schiller effect are caused by tiny inclusions of copper or hematite plates during cooling.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads) and as a collector's specimen due to its unique optical properties.
Geological facts
The optical phenomenon called 'aventurescence' gives sunstone its metallic glitter. It is the official state gemstone of Oregon, USA, which is famous for producing high-quality copper-bearing specimens.
Field identification & locations
Identify by its warm orange hue and distinctive metallic flash (schiller) when rotated under light. Found in Oregon (USA), Norway, Tanzania, and India.
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