Definition
Marble is a non-foliated metamorphic rock which is composed of recrystallized carbonate which is formed when limestone is exposed to high temperatures and pressures over a long time
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Egypt
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From the Greek marmaros, shining stone and also from the English word marmoreal meaning marble-like
From Greek trakhus rough’ or trakhutēs roughness
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock