Definition
Granulite is fine to medium grained metamorphic rock with a granular of polygonal crystals.
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Central Europe
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Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From Latin granulum, a little grain or fine grained
From Greek trakhus rough’ or trakhutēs roughness
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock