igneous
Rounded porous volcanic rock (likely scoria)
Scoria, vesicular basalt
AI-generated identification · may be incorrectTan-brown, dull to earthy luster, with numerous small vesicles; likely dominated by plagioclase, pyroxene, and volcanic glass. Basaltic scoria is about Mohs 5–6; crystal structure varies because it is a mixed-grain rock.
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Physical properties
Tan-brown, dull to earthy luster, with numerous small vesicles; likely dominated by plagioclase, pyroxene, and volcanic glass. Basaltic scoria is about Mohs 5–6; crystal structure varies because it is a mixed-grain rock.
Formation & geological history
Formed as gas-rich basaltic lava cooled rapidly, trapping bubbles; typically Quaternary or younger, though the image alone cannot determine its age.
Uses & applications
Scoria is used as lightweight aggregate, drainage or landscaping stone, and sometimes as a natural abrasive. This small rounded specimen is mainly suitable for collecting.
Geological facts
Its holes are former gas bubbles (vesicles); weathering and transport can round and discolor volcanic fragments.
Field identification & locations
The porous texture supports a volcanic origin, but the tan color and rounded shape are not enough to confirm scoria; compare its light weight and gritty surface with local volcanic rocks. Vesicular basalts occur in volcanic regions worldwide.
