Definition
Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers
An iron rich extrusive rock found as a member of the alkali basalt magma series
History
Origin
-
Isle of Mull, Scotland
Discoverer
Unknown
Ben More
Etymology
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone
From the name of discoverer, Ben More
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
Volcanic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock