Definition
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica
Trachyte is a grey fine-grained volcanic rock which mainly consists of alkali feldspar
History
Origin
Western Australia, Minnesota
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Discoverer
Newton Horace Winchell
Alexandre Brongniart and René Just Haüy
Etymology
From the name of Taconic Mountains in New England
From Greek trakhus rough’ or trakhutēs roughness
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Medium Hardness Rock
Family
Group
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Volcanic
Other Categories
Coarse Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock