Definition
Gabbro is an intrusive igneous rock which is chemically equivalent to plutonic Basalt
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica
History
Origin
Germany
Western Australia, Minnesota
Discoverer
Christian Leopold von Buch
Newton Horace Winchell
Etymology
From Latin glaber bare, smooth, bald
From the name of Taconic Mountains in New England
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
Family
Group
Plutonic
-
Other Categories
Coarse Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock