igneous
Vesicular volcanic rock (possibly scoria)
Scoria, a vesicular basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectBrown, rough, and porous, with cavities formed by escaping gas; likely composed mainly of plagioclase, pyroxene, and possibly olivine. Typical scoria has Mohs hardness around 5–6 and a generally dull to slightly glassy luster; the photo alone cannot confirm composition or density.
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Physical properties
Brown, rough, and porous, with cavities formed by escaping gas; likely composed mainly of plagioclase, pyroxene, and possibly olivine. Typical scoria has Mohs hardness around 5–6 and a generally dull to slightly glassy luster; the photo alone cannot confirm composition or density.
Formation & geological history
Forms when gas-rich lava cools rapidly near the surface, commonly during volcanic eruptions. Its age and exact formation setting cannot be determined from the image.
Uses & applications
Scoria is used as lightweight aggregate, landscaping stone, drainage material, and sometimes as an abrasive; attractive pieces may be collected.
Geological facts
Its abundant gas bubbles, called vesicles, distinguish it from many dense volcanic rocks.
Field identification & locations
Look for a lightweight, vesicular texture and reddish-brown to dark color; scoria occurs near basaltic volcanoes worldwide. The specimen’s identification is provisional because no scale, fresh surface, or locality is provided.
