Blue Goldstone
Man-made glass containing cobalt and metallic copper crystallites · Decorative Stone / Synthetic Gemstone
Crystal System
Amorphous (Man-made glass, lacks a true crystal system)
Mineral Group
Man-made vitreous material / Synthetic glass
Chemical Formula
SiO2 (glass matrix) with Cu (copper) and Co (cobalt) inclusions
Formation Process
Synthetic/Man-made via a chemical reduction process in a low-oxygen furnace
About This Crystal
A polished, tumbled, cushion-shaped piece of deep blue or dark indigo glass densely packed with glittering metallic copper flakes that sparkle intensely under light, presenting a starry night sky appearance.
Physical Characteristics
Dark blue body color with a white streak, amorphous habit, no cleavage, conchoidal fracture, specific gravity around 2.5 to 2.8, brittle tenacity, metallic to vitreous luster, opaque to translucent.
Optical Properties
Singly refractive, vitreous luster, exhibits pronounced metallic glitter (aventurescence) due to suspended copper crystals, no pleochroism or birefringence.
Hardness & Durability
Origin Region
Manufactured globally, primarily in Italy, China, and India
Hardness & Durability
Mohs hardness of approximately 5.5 to 6, moderate toughness, sensitive to extreme thermal shock and harsh chemicals, requires careful wear in jewelry to avoid scratching.
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid ultrasonic cleaners and harsh chemicals, store separately to prevent scratching by harder minerals, safe from sunlight fading.
Rarity & Value
Very common and inexpensive as it is entirely man-made, valued purely for its attractive decorative appearance rather than mineralogical rarity.
Special Characteristics
Displays strong aventurescence with bright sparkling metallic points resembling a starry night sky, created by the precipitation of elemental copper crystals within a cobalt-rich glass melt.
Lore & History
Invented in 17th-century Italy by the Miotti family through an accidental discovery in a glass-making shop in Venice. In crystal healing lore, blue goldstone is considered a stone of ambition, vitality, and learning, often associated with the throat chakra, though these are entirely traditional beliefs.