Definition
It is a metamorphic magnesium rich rock because it is composed of the mineral talc
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
History
Origin
USA
Italy
Discoverer
Unknown
Unknown
Etymology
From 17th century, because of its greasy feel and use like a soap
From a Latin word tophous then in Italian tufo and finally tuff
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock