Synthetic/Man-made glass (often mistaken for a mineral)
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Hardness: 5.5-6 on Mohs scale; Color: Reddish-brown with metallic gold flecks; Luster: Vitreous (glassy); Crystal Structure: Amorphous (non-crystalline); Specific Gravity: 2.5-2.8.
- Hardness
- 5
- Color
- Reddish-brown with metallic gold flecks
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 5.5-6 on Mohs scale; Color: Reddish-brown with metallic gold flecks; Luster: Vitreous (glassy); Crystal Structure: Amorphous (non-crystalline); Specific Gravity: 2.5-2.8.
Formation & geological history
Produced in a low-oxygen reducing atmosphere by melting silica, borax, copper oxide, and other agents. Unlike natural rocks, it is manufactured in factories; its modern discovery is attributed to 17th-century Venetian glassmaking by the Miotti family.
Uses & applications
Primarily used for jewelry (beads, cabochons), carvings, decorative ornaments, and metaphysical/healing stone collections.
Geological facts
In many legends, monks are credited with its accidental creation. While it is man-made, it is frequently sold alongside natural crystals like Aventurine or Sunstone due to its visual similarity and the optical effect known as 'aventurescence'.
Field identification & locations
Identify by looking for uniform, tiny, triangular or hexagonal metallic copper scales trapped inside glass. It is never found in nature. Collectors can find it at gift shops and mineral shows globally.
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Aventurine Glass (Man-made)
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Man-made Synthetic Glass (Silicon Dioxide with metal additives)
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Synthetic Opalised Glass
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Man-made Glass (SiO2 + additives)
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