igneous
Pumice
Volcanic glass / Pumice
AI-generated identification · may be incorrectHardness 6 on Mohs scale; white, gray, or yellowish color; dull to earthy luster; amorphous glass crystal structure; specific gravity less than 1, allowing it to float.
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Physical properties
Hardness 6 on Mohs scale; white, gray, or yellowish color; dull to earthy luster; amorphous glass crystal structure; specific gravity less than 1, allowing it to float.
Formation & geological history
Forms during explosive volcanic eruptions when frothy lava cools rapidly, trapping gas bubbles.
Uses & applications
Used in lightweight concrete, abrasive products, pumice stones for personal care, and horticulture.
Geological facts
Pumice is one of the few rocks that can float on water due to its high porosity.
Field identification & locations
Easily identified by its extremely low density, light color, and vesicular texture filled with tiny gas cavities. Found globally near active or past volcanic regions.
