igneous
Reddish vesicular volcanic rock, likely scoria
Scoria, a vesicular basaltic-to-andesitic volcanic rock
AI-generated identification · may be incorrectThe specimen is reddish brown, dull to slightly earthy, and rounded, with small gas-bubble cavities. Scoria is typically dominated by plagioclase and pyroxene, sometimes with olivine; hardness is roughly 5–6 on the Mohs scale, with no regular cleavage.
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Physical properties
The specimen is reddish brown, dull to slightly earthy, and rounded, with small gas-bubble cavities. Scoria is typically dominated by plagioclase and pyroxene, sometimes with olivine; hardness is roughly 5–6 on the Mohs scale, with no regular cleavage.
Formation & geological history
Forms when gas-rich lava cools rapidly at or near the surface, trapping bubbles; its red color commonly results from oxidation of iron. It can form during eruptions of many ages.
Uses & applications
Used as lightweight aggregate, drainage material, landscaping stone, and occasionally in abrasive or decorative products.
Geological facts
Scoria is often called volcanic cinder; its numerous vesicles make it lighter than many other volcanic rocks, though it is usually not as light as pumice.
Field identification & locations
Look for abundant small, irregular cavities and a rough, iron-stained surface; common near basaltic volcanic fields and cinder cones. The photo suggests scoria, but a definitive identification requires closer examination.
