Blue Goldstone
Man-made Glass (Synthetic Aventurine Glass) · Decorative Stone / Synthetic Gemstone
Crystal System
Amorphous (Non-crystalline glass)
Mineral Group
Man-made Silicate Glass
Chemical Formula
SiO2 with dispersed Cu and Co particles
Formation Process
Human-made via industrial glass-making processes involving the reduction of copper compounds within a molten silica matrix under controlled low-oxygen conditions.
About This Crystal
The specimen is a carved, polished figurine displaying a dark, deep blue or nearly black body color filled with countless tiny, highly reflective metallic copper crystals suspended throughout the glass, creating a sparkling night-sky effect.
Physical Characteristics
Deep dark blue to black body color with a white to colorless streak. It is completely amorphous with no cleavage, exhibiting a conchoidal fracture. Specific gravity is approximately 2.5 to 2.8. The tenacity is brittle.
Optical Properties
Isotropic (singly refractive) due to its glass nature. Exhibits strong metallic avventurescence (spangled appearance) due to the reflection of light off suspended microscopic crystals of metallic copper.
Hardness & Durability
Origin Region
Synthetically manufactured globally, primarily in China, India, and Italy
Hardness & Durability
Mohs hardness of approximately 5.5 to 6.0. Moderate toughness, sensitive to thermal shock and scratching by harder stones like quartz.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid harsh chemicals, ultrasonic cleaners, and sudden extreme temperature changes to prevent cracking.
Rarity & Value
Very common and inexpensive. Value is determined entirely by the craftsmanship and size of the carved object rather than material rarity.
Special Characteristics
Notable for its intense sparkly appearance (aventurescence) caused by suspended copper flakes, mimicking a starry night sky inside a deep blue medium.
Lore & History
Popular in modern metaphysical practices as a stone of ambition, vitality, and confidence. Historically, goldstone was supposedly invented by Italian monks in the 17th century through an accidental alchemical spill, though similar sparkling glasses date back to ancient Persia.