mineral (synthetic glass)

Blue Goldstone

Aventurine Glass (SiO2 with Co and metallic inclusions)

AI-generated identification · may be incorrect

Hardness: 5.5-6 on the Mohs scale; Color: Deep midnight blue and semi-translucent; Luster: Vitreous with bright metallic aventurescence; Crystal structure: Amorphous; Cleavage: None (conchoidal fracture); Specific gravity: ~2.5

Hardness: 5
Color: Deep midnight blue and semi-translucent
Luster: Vitreous with bright metallic aventurescence

Identified March 25, 2026More mineral (synthetic glass) →

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Physical properties

Formation & geological history

Blue goldstone is a synthetic material produced in a low-oxygen reducing atmosphere. It is created by melting silica, borax, and copper salts or cobalt oxide. It was originally perfected by the Miotti family in 17th-century Venice, Italy, though legends claim much older origins.

Uses & applications

Primarily used for jewelry such as cabochons, beads, and pendants. It is widely used in New Age practices, carvings, and as a decorative stone for ornaments.

Geological facts

Despite its name, it contains no gold; the 'gold' refers to the sparkling inclusions. Blue goldstone specifically uses cobalt or manganese to achieve its deep blue color, while the standard reddish-brown version uses copper.

Field identification & locations

Identify by its uniform, starry appearance that naturally occurring minerals rarely mimic so perfectly. Look for tiny, flat, triangular or hexagonal metallic flakes suspended in glass. Unlike natural aventurine, goldstone's sparkles are very evenly distributed.