Man-made material (Simulated Mineral)
Goldstone (Red)
Aventurine Glass
Hardness: 5-6 (Mohs scale); Color: Reddish-brown with metallic sparkles; Luster: Vitreous; Crystal Structure: Amorphous (glass) containing octahedral copper crystals; Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.8
- Hardness
- 5-6 (Mohs scale)
- Color
- Reddish-brown with metallic sparkles
- Luster
- Vitreous
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Physical properties
Hardness: 5-6 (Mohs scale); Color: Reddish-brown with metallic sparkles; Luster: Vitreous; Crystal Structure: Amorphous (glass) containing octahedral copper crystals; Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.8
Formation & geological history
Goldstone is a synthetic glass produced in a low-oxygen reducing atmosphere. The process was likely invented in 17th-century Venice (Murano) by the Miotti family. While not geological, it is created by melting silica, copper oxide, and other metal oxides, then cooling slowly to allow copper ions to precipitate into tiny metallic crystals.
Uses & applications
Primarily used for jewelry (beads, cabochons, carvings), decorative ornaments, and healing stone collections. It is a popular 'entry-level' specimen for amateur gem collectors due to its high glitter effect.
Geological facts
Legend says it was discovered by accident when Italian monks spilled copper filings into molten glass, though it is actually a precise chemical process. It is often misidentified as 'sunstone', which is a naturally occurring feldspar mineral.
Field identification & locations
Identify by its uniform, intense sparkle (aventurescence) throughout a glass matrix. In the field, it will never be found in a natural rock vein or outcrop; it is almost always found as tumbled stones or polished items in shops. It has a distinctive glassy fracture when broken.
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Man-made glass (traditionally simulated Opal)
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Synthetic Glass (Amorphized Silicon Dioxide)
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Synthetic Glass (Simulated Opal)
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Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
N/A - Non-Geological Item
not a rock/mineral
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material