Definition
Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals
Travertine is a mineral consisting of layered calcium carbonate formed by deposition from spring waters
History
Origin
Spain
Italy
Discoverer
Unknown
Marcus Vitruvius Pollio
Etymology
From Old French pomis, from a Latin dialect variant of pumex
From Italian travertino a kind of building stone, from Tiburs, adjective from Tibur (Tivoli), in Italy
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock