Definition
Limestone is a sedimentary rock composed mostly of calcite and aragonite, which are different crystal forms of calcium carbonate
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
New Zealand
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Discoverer
Belsazar Hacquet
Alexandre Brongniart and René Just Haüy
Etymology
From lime and stone in late 14th Century
From Greek trakhus rough’ or trakhutēs roughness
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock