Definition
Tachylite is a vitreous form of basaltic volcanic glass. This glass is formed naturally by the rapid cooling of molten basalt
Charnockite is a variety of granite containing minerals like orthopyroxene, quartz, and feldspar
History
Origin
Iceland
Tamil Nadu, India
Discoverer
Unknown
T. H. Holland
Etymology
From German Tachylite, from tachy- + Greek lutos soluble, melting
From Job Charnock, an administtrator of East India Company
Class
Igneous Rocks
Igneous Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Volcanic
Plutonic
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock