Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
A yellow sandstone which is flexible when cut into thin strips
From the name of a mountain range where it was found; Itacolumi mountain in Brazil
Coarse Grained Rock, Fine Grained Rock, Opaque Rock
Chalk is a soft, white, powdery limestone consisting mainly of fossil shells of foraminifers
From old English cealc chalk, lime, plaster; pebble, from Greek khalix small pebble, in English transferred to the opaque, white, soft limestone
Fine Grained Rock, Opaque Rock