Blue Goldstone

Hardness: 5-6 (Mohs scale), Color: Dark blue with sparkling copper flecks, Luster: Vitreous to sub-metallic, Crystal Structure: Amorphous (glass), Cleavage: None (conchoidal fracture), Specific Gravity: Approximately 2.5-2.8

Blue Goldstone is a type of glittering glass created in a low-oxygen reducing atmosphere. It is made by melting silica glass with copper or other metal oxides (like cobalt or manganese for blue color, and chromium for green) and then cooling it slowly to allow metallic crystals to precipitate out. The sparkling effect comes from tiny, highly reflective metallic crystals suspended within the glass matrix. It does not have a geological age as it is man-made.

Blue Goldstone is primarily used in jewelry making, including beads, cabochons, and sculptures. Its unique sparkling appearance makes it a popular choice for decorative items and as a simulated gemstone. It is also sometimes used in ornamental crafts.

Although often mistaken for a natural stone, Goldstone is an artificial glass. Its creation dates back to 17th century Venice, Italy, by the Miotti family, who were alchemists. There are several myths and legends surrounding its accidental discovery by monks. Different metallic compounds can be used to create variations, such as red goldstone (copper), blue goldstone (cobalt/manganese), green goldstone (chromium), and purple goldstone (manganese).

Blue Goldstone is easily identified by its characteristic sparkling inclusions that resemble a starry night sky, particularly against a dark blue background. The 'sparkles' are uniformly distributed and appear as tiny, flat, reflective flakes within the material. In natural aventurine quartz, the inclusions (fuchsite or hematite) are often less uniformly distributed and may appear more granular. It can be found globally through jewelry suppliers and craft stores since it is manufactured rather than mined. For collectors, it's important to differentiate it from natural aventurine or other natural sparkling minerals. A common field identification tip is its uniform shimmer and often 'perfect' sparkle which is rarely seen in natural stones.