Definition
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
Diatomite is a fine-grained sedimentary rock which is formed from consolidated diatomaceous earth
History
Origin
-
Germany
Discoverer
Alexandre Brongniart and René Just Haüy
Unknown
Etymology
From Greek trakhus rough’ or trakhutēs roughness
From diatom + -ite1
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock