Definition
Peridotite is a dense, coarse-grained plutonic is the main constituent of the earth's mantle
Tonalite is a coarse-grained plutonic rock consisting mainly of sodic plagioclase, quartz, and hornblende or other mafic minerals with phaneritic texture
Origin
Pike County, U.S
Tonale, Italy
Discoverer
Unknown
Warren Hamilton
Etymology
From French, from peridot + -ite
From Tonale Pass, northern Italy, + -ite1
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock