Definition
Breccia is a rock consisting of angular fragments of stones which are cemented by finer calcareous material
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
History
Origin
England
USA
Discoverer
Unknown
Unknown
Etymology
From Italian, literally gravel, Germanic origin and related to break
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
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