igneous
Porous volcanic rock, likely scoria
Scoria, a vesicular basaltic to andesitic volcanic rock
AI-generated identification · may be incorrectGray, rough, and full of rounded gas cavities (vesicles); typically composed mainly of plagioclase, pyroxene, and sometimes olivine. Hardness is variable, roughly 5–6 Mohs for the solid minerals; the image alone does not reveal its precise composition.
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Physical properties
Gray, rough, and full of rounded gas cavities (vesicles); typically composed mainly of plagioclase, pyroxene, and sometimes olivine. Hardness is variable, roughly 5–6 Mohs for the solid minerals; the image alone does not reveal its precise composition.
Formation & geological history
Forms when gas-rich lava cools quickly, trapping bubbles; it may be geologically young or much older depending on the volcanic deposit.
Uses & applications
Used as lightweight aggregate, drainage and landscaping stone, and in some abrasive or horticultural applications; uncommon as jewelry material.
Geological facts
Scoria is denser and generally darker than pumice, with fewer and larger vesicles. The specimen’s gray color and texture are consistent with scoria, though a photograph cannot confirm identification.
Field identification & locations
Look for abundant cavities, rough texture, and a volcanic appearance; found near cinder cones and lava flows worldwide. The pictured specimen lacks scale and diagnostic tests, so exact identification is uncertain.
