mineral

Goldstone

Aventurine Glass (Man-made)

Hardness: 5.5-6 (Mohs scale); Color: Reddish-brown with metallic copper sparkles; Luster: Vitreous; Crystal Structure: Amorphous (glass); Specific Gravity: 2.5

Hardness: 5
Color: Reddish-brown with metallic copper sparkles
Luster: Vitreous

Identified May 2, 2026More mineral →

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Physical properties

Hardness: 5.5-6 (Mohs scale); Color: Reddish-brown with metallic copper sparkles; Luster: Vitreous; Crystal Structure: Amorphous (glass); Specific Gravity: 2.5

Formation & geological history

Synthetic material first created in 17th-century Venice, Italy. It is formed by melting silica, borax, and copper oxides in a low-oxygen environment, where copper ions crystallize into tiny metallic flakes as the glass cools slowly.

Uses & applications

Used primarily in jewelry, cabochons, decorative carvings, beads, and metaphysical items.

Geological facts

Although often mistaken for a natural mineral, it is a human-made glass. Legend says it was accidentally discovered by Venetian monks who spilled copper filings into a vat of molten glass, though the Miotti family held the original patent.

Field identification & locations

Identify by its distinctive uniform 'aventurescence' (glitter) and glass-like texture. It is not found in nature; as a synthetic material, it is manufactured in factories worldwide.