mineral
Blue Glass / Slag Glass
Amorphous silicon dioxide (SiO2) with cobalt colorants
AI-generated identification · may be incorrectMohs hardness 5.5-6, vibrant royal blue color, vitreous luster, amorphous crystal structure with conchoidal fracture.
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Physical properties
Mohs hardness 5.5-6, vibrant royal blue color, vitreous luster, amorphous crystal structure with conchoidal fracture.
Formation & geological history
Formed as a byproduct of industrial glass manufacturing or metal smelting rather than natural geological processes.
Uses & applications
Commonly collected as lapidary rough, decorative display items, or used in landscaping and landscaping glass.
Geological facts
Often mistaken by amateur collectors for natural blue minerals like sapphire or lazurite due to its striking color.
Field identification & locations
Identified by its conchoidal fracture, vitreous luster, and complete lack of crystal faces or cleavage planes.
