Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Tonalite is a coarse-grained plutonic rock consisting mainly of sodic plagioclase, quartz, and hornblende or other mafic minerals with phaneritic texture
History
Origin
Italy
Tonale, Italy
Discoverer
Unknown
Warren Hamilton
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From Tonale Pass, northern Italy, + -ite1
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock