Definition
Rhyodacite is an extrusive volcanic rock intermediate in composition between dacite and rhyolite
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
History
Origin
USA
Pike County, U.S
Discoverer
Unknown
Unknown
Etymology
Rhyo lite + dacite : a rock intermediate between rhyolite and dacite that is the extrusive equivalent of granodiorite
From French, from peridot + -ite
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock