Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Amphibolite can be defined as a granular metamorphic rock which mainly consist of hornblende and plagioclase
History
Origin
-
-
Discoverer
Alexandre Brongniart and René Just Haüy
Alexandre Brongniart
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From Amphibole + -ite
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Medium Grained Rock, Opaque Rock