mineral
Sunstone
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
Hardness: 6-6.5 (Mohs), Color: Orange/Red/Peach with metallic inclusions, Luster: Vitreous to Pearly, Crystal structure: Triclinic, Specific Gravity: 2.62-2.65
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs), Color: Orange/Red/Peach with metallic inclusions, Luster: Vitreous to Pearly, Crystal structure: Triclinic, Specific Gravity: 2.62-2.65
Formation & geological history
Formed in cooling basaltic or andesitic lava flows. The internal schiller effect is caused by minute platelets of copper or hematite oriented within the crystal lattice during slow cooling.
Uses & applications
Primarily used as a semi-precious gemstone for jewelry (rings, pendants, earrings) and as a collector's mineral.
Geological facts
Oregon Sunstone contains unique copper inclusions and is the official state gemstone of Oregon. The optical effect seen in these stones is known as 'aventurescence'.
Field identification & locations
Identify by looking for the 'schiller effect', which appears as a metallic flash or glitter when the stone is tilted under light. Commonly found in Oregon (USA), Norway, Tanzania, and India.
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Green Apatite on Albite
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