man-made glass / industrial byproduct
Slag Glass / Industrial Slag
Anthropogenic Glass
AI-generated identification · may be incorrectGlassy luster, conchoidal fracture, variable hardness (typically 5-6), varied colors often dark blue or green with bubbles (vesicles), often mixed with rocky or sandy matrix.
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Physical properties
Glassy luster, conchoidal fracture, variable hardness (typically 5-6), varied colors often dark blue or green with bubbles (vesicles), often mixed with rocky or sandy matrix.
Formation & geological history
Byproduct of smelting ore or industrial glassmaking. Often discarded near old foundries, smelters, or factories.
Uses & applications
No significant industrial purpose once discarded, sometimes collected for its unique appearance or used as fill.
Geological facts
Often mistaken for obsidian or other natural volcanic glass. The bubbles and bright colors (like the dark blue seen here) are telltale signs of industrial origin.
Field identification & locations
Identify by presence of spherical bubbles, glassy texture, and context of location (often found near old industrial sites).
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