igneous
Likely scoria (vesicular basalt)
Vesicular basalt; chiefly plagioclase, pyroxene, and possibly olivine
AI-generated identification · may be incorrectDark gray to black, rough and porous with small gas-bubble cavities; typically Mohs 5–6, dull to slightly vitreous, with fine-grained crystals not individually visible. The photo alone cannot establish its density or exact mineral composition.
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Physical properties
Dark gray to black, rough and porous with small gas-bubble cavities; typically Mohs 5–6, dull to slightly vitreous, with fine-grained crystals not individually visible. The photo alone cannot establish its density or exact mineral composition.
Formation & geological history
Forms when gas-rich basaltic lava cools rapidly at or near the surface; commonly associated with volcanic eruptions, generally younger than the underlying crustal rocks.
Uses & applications
Used as lightweight aggregate, landscaping stone, and abrasive; attractive pieces may be kept as inexpensive volcanic-rock specimens.
Geological facts
Scoria is vesicular like pumice but is usually darker and denser, and its cavities are often larger and less interconnected.
Field identification & locations
The dark color and abundant pits suggest scoria, though the specimen’s identity cannot be confirmed from the image alone. Common around basaltic volcanoes and cinder cones; a comparatively heavy feel and scratch resistance help distinguish it from pumice.
