igneous
Vesicular volcanic rock (likely pumice or scoria)
Vesicular volcanic rock; composition cannot be determined from the image, but likely pumice or scoria
AI-generated identification · may be incorrectPale gray-beige, highly porous, with abundant rounded gas cavities and a few darker mineral grains. Likely hardness about 5–6 for pumice or 5–6 for scoria; typically dull to glassy, with no obvious cleavage and fine-grained volcanic glass or crystals.
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Physical properties
Pale gray-beige, highly porous, with abundant rounded gas cavities and a few darker mineral grains. Likely hardness about 5–6 for pumice or 5–6 for scoria; typically dull to glassy, with no obvious cleavage and fine-grained volcanic glass or crystals.
Formation & geological history
Formed when gas-rich lava rapidly cooled, trapping bubbles; the exact age and eruption setting cannot be inferred from appearance alone.
Uses & applications
Pumice is used as an abrasive, lightweight aggregate, and horticultural amendment; scoria is commonly used in landscaping, drainage, and construction aggregate.
Geological facts
Pumice is often light enough to float, while darker, denser scoria generally sinks; color alone is not decisive for identifying this piece.
Field identification & locations
Its numerous vesicles strongly indicate volcanic origin. Check whether it is unusually lightweight and floats (pumice) or is denser and heavier (scoria); volcanic regions worldwide are common sources.
