Mineral (Man-made glass)
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Hardness: 5.5-6.0 on Mohs scale; Color: Reddish-brown with metallic gold-colored flecks; Luster: Vitreous (glassy); Crystal Structure: Amorphous (non-crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.8
- Hardness
- 5
- Color
- Reddish-brown with metallic gold-colored flecks
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 5.5-6.0 on Mohs scale; Color: Reddish-brown with metallic gold-colored flecks; Luster: Vitreous (glassy); Crystal Structure: Amorphous (non-crystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.5-2.8
Formation & geological history
Goldstone is a synthetic glass created in a low-oxygen reducing atmosphere. It is formed by melting silica, copper oxide, and other metal oxides. As the glass cools slowly, the copper ions precipitate into tiny, flat metallic crystals (micro-platelets), creating a sparkly effect known as aventurescence. Its origins date back to 17th-century Venice.
Uses & applications
Primarily used as a decorative gemstone for jewelry (pendants, beads, cabochons), carvings, and metaphysical healing practices. It is a popular substitute for natural aventurine or sunstone due to its high sparkle.
Geological facts
Legend often attributes its creation to Italian monks who 'accidentally' spilled copper filings into a vat of molten glass, though the true history lies with Venetian glassmakers like the Miotti family who held the patent. It is one of the few man-made materials frequently sold alongside natural crystals in mineral shops.
Field identification & locations
Identify in the field by its distinct, overly uniform distribution of highly reflective copper triangular/hexagonal platelets within a glass matrix. Unlike natural minerals, it may contain tiny air bubbles visible under magnification and lacks a natural geological field location, being produced in factory settings globally.
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