Goldstone
Man-made glass containing metallic copper crystals · Decorative Stone / Synthetic Gemstone
Crystal System
Amorphous (synthetic glass)
Mineral Group
Man-made vitreous material
Chemical Formula
SiO2 (glass matrix) with Cu (copper inclusions)
Formation Process
Synthetic (human-made through a specialized melting and controlled cooling process of silica, copper oxide, and other metallic elements)
About This Crystal
A tumbled, polished, opaque reddish-brown stone characterized by a dense scattering of glittering metallic copper crystals suspended throughout the glass matrix, producing an intense starry or spangled visual effect.
Physical Characteristics
Reddish-brown body color with metallic golden-copper specks, white streak, amorphous cleavage with conchoidal fracture, specific gravity around 2.4 - 2.6, brittle tenacity, non-magnetic, no significant fluorescence
Optical Properties
Singly refractive isotropic glass matrix, non-pleochroic, displays a distinct metallic spangled appearance caused by light reflecting off suspended microscopic copper crystals (aventurescence)
Hardness & Durability
Origin Region
Synthetically manufactured globally, historically originated in 17th-century Venice (Italy)
Hardness & Durability
Mohs hardness of 5.5 to 6, moderate durability, sensitive to thermal shock and harsh acids, suitable for most jewelry applications if handled with care
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid ultrasonic cleaners, harsh chemicals, and extreme temperature changes; store separately to prevent scratching softer stones
Rarity & Value
Common, widely mass-produced and inexpensive, valued strictly as an ornamental and decorative gemstone for its attractive appearance
Special Characteristics
Displays strong aventurescence due to the presence of millions of microscopic reflective copper platelets distributed evenly within the glassy matrix
Lore & History
Often associated with vitality, ambition, and confidence in modern crystal healing practices, linked traditionally to the sacral chakra; historically invented by Italian monks in Venice during the 17th century through alchemical tradition