igneous
Vesicular volcanic rock (likely scoria)
Scoria, typically basaltic or andesitic volcanic ejecta
AI-generated identification · may be incorrectTan to rusty-brown, rough and highly vesicular, with a dull to slightly glassy luster. The image does not show enough detail to establish mineral composition or hardness; scoria commonly contains plagioclase, pyroxene, and iron oxides, with Mohs hardness around 5–6.
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Physical properties
Tan to rusty-brown, rough and highly vesicular, with a dull to slightly glassy luster. The image does not show enough detail to establish mineral composition or hardness; scoria commonly contains plagioclase, pyroxene, and iron oxides, with Mohs hardness around 5–6.
Formation & geological history
Forms when gas-rich lava cools rapidly, trapping bubbles as it erupts. It may be geologically recent or much older; age and exact origin cannot be determined from the photo.
Uses & applications
Used as lightweight landscaping aggregate, drainage material, and in some construction mixes; attractive pieces may be collected as specimens.
Geological facts
The holes are gas-bubble cavities (vesicles); scoria is generally denser and darker than pumice, though weathering can make it appear tan or rusty.
Field identification & locations
Look for abundant irregular cavities, a rough texture, and volcanic appearance; common near basaltic and andesitic volcanoes. A photo alone cannot confirm scoria or distinguish it from other vesicular materials.
