Man-made material (Simulated Mineral)

Goldstone (Red)

Aventurine Glass

AI-generated identification · may be incorrect

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

Identified March 21, 2026More man-made material (simulated mineral) →

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Physical properties

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.