Definition
Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers
History
Origin
-
Discoverer
Unknown
Etymology
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone
Class
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Family
Group
-
Other Categories
Fine Grained Rock, Opaque Rock