man-made glass
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
Hardness: 5-5.5 (Mohs), Color: Dark blue with silvery or bluish sparkles, Luster: Vitreous (glassy), Crystal structure: Amorphous base with crystalline metallic flecks, Cleavage: None (conchoidal fracture).
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.5 (Mohs), Color: Dark blue with silvery or bluish sparkles, Luster: Vitreous (glassy), Crystal structure: Amorphous base with crystalline metallic flecks, Cleavage: None (conchoidal fracture).
Formation & geological history
Manufactured in a laboratory or factory setting. Created by melting silica glass with metal oxides (like cobalt or manganese) and allowing it to crystallize under specific cooling conditions.
Uses & applications
Used primarily in lapidary arts, jewelry making, and as a decorative collector's item or carving material.
Geological facts
Goldstone was originally invented in 17th century Venice. While reddish-brown goldstone uses copper, blue goldstone uses cobalt or manganese to achieve its dark night-sky appearance.
Field identification & locations
Easily identified by its intense sparkle against a dark, homogeneous glassy background and conchoidal fracture. Often sold alongside natural stones in metaphysical and gem shops.
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