Definition
Jasperoid is a rare, peculiar type of metasomatic alteration of rocks
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 silica, the main mineral content of Jasperoid
From a Latin word tophous then in Italian tufo and finally tuff
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock