Definition
It is a metamorphic magnesium rich rock because it is composed of the mineral talc
Andesite is a dark, fine-grained, brown or greyish intermediate volcanic rock which is a commonly found in lava
History
Origin
USA
North America
Discoverer
Unknown
Theodor von Gümbel
Etymology
From 17th century, because of its greasy feel and use like a soap
From Andes mountains, where it is found in abundance
Class
Metamorphic Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
-
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock