Geology Superstore
Geology Superstore

Chalk (1kg)

£5.00 ex VAT

Chalk is a fine, porous, white form of limestone of Cretaceous age. Formed from the accumulation of coccoliths in a relatively deep marine environment. Supplied by weight, sizes vary.

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Chalk is a soft, white, porous sedimentary carbonate rock, a form of limestone. Cretaceous in age. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find chert or flint nodules embedded in chalk. Brilliant white chalk cliffs are a dominant feature of the Yorkshire coast & the south coast of England. Supplied by weight in lots of 1 kilo, pieces are random in size and come in a polythene bag with a data label.

Weight 1100 g

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