Definition
Breccia is a rock consisting of angular fragments of stones which are cemented by finer calcareous material
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
England
-
Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From Italian, literally gravel, Germanic origin and related to break
From Greek trakhus rough’ or trakhutēs roughness
Class
Sedimentary 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