Definition
Teschenite is coarse- to fine-grained, dark-coloured intrusive igneous rock that usually occurs in sills, dikes and irregular masses and is always altered to some extent
Marl is an unconsolidated sedimentary rock consisting of clay and lime
History
Origin
Scotland
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Discoverer
Unknown
William Smith
Etymology
From its occurrence near Teschen. now known as Cieszyn, Pol., Scotland
From Old French marle, from Late Latin marglia
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Soft Rock
Family
Group
Plutonic
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Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock