mineraloid
Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
Hardness: 5.5-6.5 (Mohs scale); Color: Vibrant turquoise/teal blue; Luster: Vitreous/Glassy; Structure: Amorphous (non-crystalline); Cleavage: Conchoidal fracture; Specific gravity: 2.4-2.8
- Hardness
- 5
- Color
- Vibrant turquoise/teal blue
- Luster
- Vitreous/Glassy
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Physical properties
Hardness: 5.5-6.5 (Mohs scale); Color: Vibrant turquoise/teal blue; Luster: Vitreous/Glassy; Structure: Amorphous (non-crystalline); Cleavage: Conchoidal fracture; Specific gravity: 2.4-2.8
Formation & geological history
Formed as a byproduct of industrial glass manufacturing or smelting processes. It is created when molten silicate waste cools too rapidly for crystals to form, resulting in a volcanic-like glass structure similar to obsidian.
Uses & applications
Used primarily for decorative landscaping, aquarium decor, and floral arrangements. Sometimes used in costume jewelry or as a material for glass artists and knappers.
Geological facts
While it looks like a natural gemstone, this is a man-made substance. It is frequently found at old iron smelting sites or abandoned glass factories where waste was dumped. It is sometimes deceptively sold to tourists as 'Blue Obsidian' or 'Andara Crystal'.
Field identification & locations
Identify by looking for conchoidal (shell-like) fractures and air bubbles trapped inside, which are common in glass but rare in most natural crystals. Found near historic industrial sites.
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