Pumice stone in a wall in Teguise covered with lichen and sulfur, Lanzarote, Canary Islands, Spain — Photo: Norbert Nagel, Mörfelden-Walldorf, Germany · CC BY-SA 3.0
Pumice
Frothy volcanic glass — vesicular felsic rock so light it floats on water.
Intro adapted from Wikipedia (CC BY-SA).
Pumice is a rock-forming material, with the chemical formula Vesicular volcanic glass.
It crystallizes in the amorphous crystal system.
Key properties: Mohs hardness 5–6; typically white or gray.
Collections: Everyday Minerals.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data and a Wikipedia introduction — a full written entry hasn’t been published yet.
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