igneous
Vesicular volcanic rock (likely scoria)
Scoria, typically basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectBrown-gray, rough and highly vesicular, with irregular gas cavities and a dull to slightly glassy luster; chiefly plagioclase, pyroxene, and volcanic glass. Hardness is commonly about 5–6 Mohs; the photo alone cannot confirm density or exact composition.
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Physical properties
Brown-gray, rough and highly vesicular, with irregular gas cavities and a dull to slightly glassy luster; chiefly plagioclase, pyroxene, and volcanic glass. Hardness is commonly about 5–6 Mohs; the photo alone cannot confirm density or exact composition.
Formation & geological history
Forms when gas-rich lava cools rapidly, trapping bubbles; commonly associated with relatively young volcanic eruptions. A precise age and composition cannot be determined from the image.
Uses & applications
Used as lightweight aggregate, drainage material, landscaping stone, and abrasive; attractive pieces may be collected, but this specimen does not appear gem-grade.
Geological facts
Scoria’s cavities are formed by escaping volcanic gases; unlike pumice, scoria is generally darker and denser.
Field identification & locations
The pitted texture and dark volcanic-looking patches suggest scoria, though weathered vesicular basalt or another porous rock is also possible. Common near volcanoes and lava fields; a fresh broken surface and density test would help distinguish it.
