Definition
Dacite is a volcanic igneous rock which is rintermediate in composition between andesite and rhyolite
Arkose is a sedimentary rock, specifically a type of sandstone containing at least 25% feldspar
History
Origin
Romania and Moldova, Europe
France
Discoverer
Unknown
Alexandre Brongniart
Etymology
From Dacia, a province of the Roman Empire which lay between the Danube River and Carpathian Mountains where the rock was first described
From Auvergne region of France used by a French geologist Alexandre Brongniart in 1826 who applied this term to some feldspathic sandstones
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock