Definition
Pumice is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
Spain
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Discoverer
Unknown
William Smith
Etymology
From Old French pomis, from a Latin dialect variant of pumex
From Old French marle, from Late Latin marglia
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock