igneous
Pumice
Pumice, a highly vesicular volcanic rock composed mainly of rhyolitic or dacitic glass
AI-generated identification · may be incorrectVery light-colored, porous, rough and dull; typically Mohs hardness 5–6, with abundant cavities and no consistent cleavage. The image appears consistent with pumice, though texture alone cannot confirm the identification.
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Physical properties
Very light-colored, porous, rough and dull; typically Mohs hardness 5–6, with abundant cavities and no consistent cleavage. The image appears consistent with pumice, though texture alone cannot confirm the identification.
Formation & geological history
Forms when gas-rich, silica-rich lava erupts and cools rapidly, trapping bubbles in volcanic glass; it can form during eruptions of many ages.
Uses & applications
Used as an abrasive, lightweight aggregate, horticultural soil additive, and in cosmetic foot-care stones.
Geological facts
Pumice is so vesicular that some pieces can float until water fills their pores.
Field identification & locations
Look for a pale, frothy texture and very low weight; it commonly occurs near explosive volcanoes and in deposits transported by water. Similar-looking materials may require closer examination.
