igneous
Pumice
Pumice (volcanic glass foam)
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, pale white to gray or yellowish color, vitreous to dull luster, amorphous or glassy crystal structure with abundant vesicular cavities.
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Physical properties
Hardness of 6 on Mohs scale, pale white to gray or yellowish color, vitreous to dull luster, amorphous or glassy crystal structure with abundant vesicular cavities.
Formation & geological history
Formed during explosive volcanic eruptions when frothy lava cools rapidly, trapping gas bubbles within the glass matrix.
Uses & applications
Widely used in lightweight concrete, abrasive cleaning products, personal care exfoliating stones, and horticulture.
Geological facts
Pumice is one of the few igneous rocks that can float on water due to its extremely high porosity and trapped air chambers.
Field identification & locations
Easily identified by its extremely low density, rough abrasive texture, and the presence of numerous tiny gas vesicles.
