igneous
Vesicular volcanic rock (likely scoria)
Scoria, typically basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectGray, fine-grained, and porous with rounded gas cavities; likely Mohs hardness 5–6, with a dull to slightly vitreous luster. Exact mineral composition and density cannot be determined from the photo.
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Physical properties
Gray, fine-grained, and porous with rounded gas cavities; likely Mohs hardness 5–6, with a dull to slightly vitreous luster. Exact mineral composition and density cannot be determined from the photo.
Formation & geological history
Formed when gas-rich lava cooled rapidly, trapping bubbles; usually geologically young and associated with volcanic eruptions.
Uses & applications
Used as lightweight aggregate, landscaping stone, and sometimes abrasive material; this small specimen is mainly of collecting interest.
Geological facts
Its holes are vesicles left by escaping volcanic gases; scoria is generally denser and darker than pumice.
Field identification & locations
Look for abundant cavities in a dark, solid volcanic matrix; common near cinder cones and basaltic lava fields. The specimen’s small size and gray color make identification tentative from the image alone.
