Blue Goldstone
Aventurine Glass (Man-made Glass with Cobalt) · Simulant / Decorative Man-made Material
Crystal System
Amorphous (Non-crystalline structure); typically found in mass-produced tumbled or cabochon forms.
Mineral Group
Artificial Glass (Silicate-based synthetic material)
Chemical Formula
SiO2 + (Na2O, CaO, etc.) + Co (Cobalt for blue pigment) + Cu (Copper flecks)
Formation Process
Synthetic/Hydrothermal-Industrial: Created in a low-oxygen reducing atmosphere by melting silica, copper oxides, and cobalt, followed by slow cooling to allow metal crystals to precipitate.
About This Crystal
A deep midnight-blue to indigo opaque glass filled with numerous tiny, highly reflective metallic triangular and hexagonal inclusions of copper that create a sparkling effect.
Physical Characteristics
Color: Dark blue with silvery/copper sparkles; Streak: White; Lustre: Vitreous; Fracture: Conchoidal; Density: ~2.5-2.8; Non-fluorescent.
Optical Properties
Singly refractive (isotropic); exhibit aventurescence (a glittering effect caused by light reflecting from tiny metallic platelets within the glass).
Hardness & Durability
Origin Region
Produced globally in laboratory/factory settings; historically associated with Murano, Italy.
Hardness & Durability
Mohs hardness: 5.5 to 6; Brittle tenacity; moderate durability suitable for most jewelry but prone to scratching by quartz or steel.
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid ultrasonic cleaners or harsh chemicals; store separately to prevent scratching from harder gemstones.
Rarity & Value
Common and inexpensive; value is based on the quality of the finish and the density of sparkles rather than geological rarity.
Special Characteristics
Blue goldstone is distinguished by its intense aventurescence produced by copper crystals suspended in cobalt-tinted glass.
Lore & History
Legend attributes its invention to 17th-century Italian monks (Miotti family), though similar glassmaking techniques date back to ancient Persia. It is often called the 'Stone of Ambition' in modern lore.