Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Diabase is a fine-grained igneous rock which is composed mostly of pyroxene and feldspar
History
Origin
-
Germany
Discoverer
Alexandre Brongniart and René Just Haüy
Christian Leopold von Buch
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From Greek di + base
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Medium Grained Rock, Opaque Rock