Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Granite is a very hard, granular, crystalline igneous rock which consists mainly of quartz, mica, and feldspar and is often used as building stone
History
Origin
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Discoverer
Alexandre Brongniart and René Just Haüy
Alexander von Humboldt
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From Italian granito, which means grained rock, from grano grain, and from Latin granum
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock