igneous
Light-colored volcanic pumice (probable)
Pumice, vesicular volcanic glass; typically silica-rich rhyolitic to dacitic composition
AI-generated identification · may be incorrectSmall, cream-colored, porous fragment with dark inclusions; pumice is usually glassy to dull and has Mohs hardness about 5–6, with no cleavage. The image alone does not show enough detail to confirm its texture or composition.
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Physical properties
Small, cream-colored, porous fragment with dark inclusions; pumice is usually glassy to dull and has Mohs hardness about 5–6, with no cleavage. The image alone does not show enough detail to confirm its texture or composition.
Formation & geological history
Forms when gas-rich lava rapidly cools and traps bubbles during explosive eruptions; pumice can be geologically young or much older. It commonly occurs in volcanic deposits and as material washed onto beaches.
Uses & applications
Used as an abrasive, lightweight aggregate, horticultural soil additive, and in personal-care products; suitable pieces are also collected.
Geological facts
Pumice is often light enough to float temporarily, though this tiny fragment cannot be tested reliably from the image.
Field identification & locations
Look for abundant pores and a very low weight; the pictured pale, speckled fragment is consistent with pumice but could be another porous rock or debris. Found near volcanoes and on some shorelines.
