Definition
An iron rich extrusive rock found as a member of the alkali basalt magma series
It is a metamorphic magnesium rich rock because it is composed of the mineral talc
History
Origin
Isle of Mull, Scotland
USA
Discoverer
Ben More
Unknown
Etymology
From the name of discoverer, Ben More
From 17th century, because of its greasy feel and use like a soap
Class
Igneous Rocks
Metamorphic Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Soft Rock
Family
Group
Volcanic
-
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock