Definition
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Pike County, U.S
-
Discoverer
Unknown
Alexandre Brongniart and René Just Haüy
Etymology
From French, from peridot + -ite
From Greek trakhus rough’ or trakhutēs roughness
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock