Goldstone
Synthetic Glass with Copper Inclusions · Decorative Stone / Synthetic Gemstone
Crystal System
Amorphous (Man-made glass)
Mineral Group
Silicate glass
Chemical Formula
SiO2 with Cu inclusions
Formation Process
Synthetic man-made process involving the melting of silica, copper oxides, and other metallic elements in a reducing atmosphere.
About This Crystal
A polished cabochon of reddish-brown glass densely packed with tiny, reflective metallic copper crystals that give it a glittering, spangled appearance known as aventurescence.
Physical Characteristics
Reddish-brown body color with intense metallic copper sparkles, white streak, amorphous fracture, specific gravity around 2.50 to 2.60, brittle tenacity, non-magnetic.
Optical Properties
Isotropic (singly refractive) due to being glass, highly reflective metallic inclusions causing a strong aventurescence effect.
Hardness & Durability
Origin Region
Manufactured globally, historically originated in 17th-century Venice, Italy
Hardness & Durability
Mohs hardness of 5.5 to 6, fair to poor toughness for a glass material, sensitive to thermal shock and harsh impacts.
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid ultrasonic cleaners and harsh chemicals, store separately to prevent scratching.
Rarity & Value
Very common, inexpensive man-made material, valued strictly as an ornamental and decorative gemstone.
Special Characteristics
Displays strong aventurescence (a glistening metallic glitter effect) caused by suspended microscopic copper crystals.
Lore & History
Invented in Venice by the Miotti family in the 17th century through an accidental discovery. Often associated with vitality, ambition, and positive energy in modern crystal lore, though it is entirely a human-made synthetic material.