igneous
Slag
Anthropogenic silicate slag
AI-generated identification · may be incorrectHardness varies from 5 to 6 on the Mohs scale depending on composition. Exhibits glassy to dull luster, vesicular or glassy texture, and irregular fracture.
Identified More igneous →
Explore Slag in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness varies from 5 to 6 on the Mohs scale depending on composition. Exhibits glassy to dull luster, vesicular or glassy texture, and irregular fracture.
Formation & geological history
Formed as a byproduct of smelting ore to purify metals, creating artificial rock-like material dating from ancient to modern industrial times.
Uses & applications
Used in road construction, concrete aggregate, abrasive blasting, and sometimes collected as an industrial byproduct curiosity.
Geological facts
Slag often mimics natural volcanic rocks like scoria or pumice due to trapped gas bubbles and rapid cooling during the smelting process.
Field identification & locations
Identified by its vesicular, glassy appearance, unusual weight, and association with historical mining or industrial sites.
