igneous/sedimentary
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
Light-colored, highly vesicular (porous) texture. Hardness varies depending on exact composition but is generally moderate. Pitted surface.
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Physical properties
Light-colored, highly vesicular (porous) texture. Hardness varies depending on exact composition but is generally moderate. Pitted surface.
Formation & geological history
Pumice forms from highly vesicular volcanic glass. Tufa/Travertine precipitates from carbonate minerals in ambient temperature water bodies.
Uses & applications
Pumice is used as an abrasive, in lightweight concrete, and for landscaping. Tufa is used in landscaping and architecture.
Geological facts
Pumice is so light it can often float on water.
Field identification & locations
Identified by its porous, pitted structure and relatively light weight compared to its size.
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