mineral
Sunstone
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
Hardness: 6-6.5 (Mohs scale), Color: Orange, golden, reddish-brown with shimmering inclusions, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions, Specific Gravity: 2.62-2.67
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: Orange, golden, reddish-brown with shimmering inclusions, Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions, Specific Gravity: 2.62-2.67
Formation & geological history
Formed in cooling lava flows (basalt) or in metamorphic environments. The shimmer (aventurescence) is caused by tiny inclusions of copper or hematite plates that reflect light as the crystal grows.
Uses & applications
Primarily used as a gemstone in jewelry (rings, pendants, earrings) and as a pocket stone for collectors and metaphysical practitioners.
Geological facts
Oregon Sunstone is the official state gemstone of Oregon and is unique because its aventurescence is caused by microscopic inclusions of native copper rather than hematite.
Field identification & locations
Identify by its characteristic metallic shimmer when tilted under a light source. Found commonly in Oregon (USA), Norway, Tanzania, India, and Canada. Look for feldspar-type cleavage and distinct orange-gold speckles.
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Green Apatite on Albite
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