1 Definition
1.1 Definition
Tephrite is an aphanitic to porphyritic textured, volcanic igneous rock
Taconite is a low-grade iron ore which belongs to sedimentary rock and containing about 27% iron and 51% silica
1.2 History
1.2.1 Origin
Germany
Western Australia, Minnesota
1.2.2 Discoverer
Van Tooren
Newton Horace Winchell
1.3 Etymology
From Greek tephra, ashes from Indo-European base, to burn
From the name of Taconic Mountains in New England
1.4 Class
Igneous Rocks
Sedimentary Rocks
1.4.1 Sub-Class
Durable Rock, Hard Rock
Durable Rock, Medium Hardness Rock
1.5 Family
1.5.1 Group
1.6 Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock