Definition
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica
History
Origin
Italy
Western Australia, Minnesota
Discoverer
Unknown
Newton Horace Winchell
Etymology
From a Latin word tophous then in Italian tufo and finally tuff
From the name of Taconic Mountains in New England
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
Volcanic
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Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock