1 Definition
1.1 Definition
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
Anthracite is a type of sedimentary rock which is hard and is variety of coal that has high luster
1.2 History
1.2.1 Origin
Iceland
Pennsylvania, U.S.
1.2.2 Discoverer
1.3 Etymology
From German Tachylite, from tachy- + Greek lutos soluble, melting
From Greek anthrakites, from anthrax, anthrak meaning coal
1.4 Class
Igneous Rocks
Metamorphic Rocks
1.4.1 Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft 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, Fine Grained Rock, Medium Grained Rock, Opaque Rock