igneous
Vesicular volcanic rock, likely scoria
Scoria (vesicular basalt or basaltic-andesite)
AI-generated identification · may be incorrectReddish-brown, rough, porous rock with abundant rounded gas cavities and a dull to slightly glassy surface. Likely Mohs hardness 5–6; exact mineral proportions and density cannot be determined from the image.
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Physical properties
Reddish-brown, rough, porous rock with abundant rounded gas cavities and a dull to slightly glassy surface. Likely Mohs hardness 5–6; exact mineral proportions and density cannot be determined from the image.
Formation & geological history
Formed when gas-rich basaltic lava cooled quickly, trapping bubbles; oxidation of iron gives many scoria its red-brown color. It is geologically young volcanic material, though its age cannot be determined visually.
Uses & applications
Used as lightweight aggregate, landscaping stone, drainage material, and abrasive; attractive pieces may be collected or used decoratively.
Geological facts
Scoria is denser and generally less frothy than pumice, and its cavities are usually larger and more irregular than those in many other volcanic rocks.
Field identification & locations
Look for a red-brown or dark, vesicular texture and a relatively heavy feel compared with pumice. Common near basaltic volcanoes and lava flows; the rounded shape here may reflect handling or shaping.
