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Chalk

Sedimentary Rocks

Chalk is a soft, white, porous sedimentary carbonate rock, a form of limestone composed of the mineral calcite. It formed under the sea by the accumulation and lithification of the hard parts of organisms, mostly microscopic plankton such as foraminifera and coccolithophores, that had settled to the sea floor. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/

Facts
Kind
Rock 1
Formation Class
Sedimentary, biochemical (a form of limestone built from the calcite remains of marine plankton such as foraminifera and coccolithophores) 1
Chemical Formula
CaCO3 1
Classification
Classification
Sedimentary Rock 1
Use
Building and Construction 1
Use
Soil Amendment or Fertilizer 1
Connections

Associated With

Chert, Materials

Host rock: chert occurring within chalk is conventionally distinguished by the name flint.

Source Chert (Wikipedia)
Flint, Materials

Host rock: flint occurs as nodules within chalk.

Source Flint (Wikipedia)

Caused By

Sedimentation, Processes
Source Chalk (Wikipedia)

Classified As

Sedimentary Rocks, Subcategories

In Discipline

Geology, Disciplines
Sources
1. Chalk (Wikipedia)
Wikimedia Foundation
  • Lead section
    tiny fragments of the calcite shells or skeletons of plankton, such as foraminifera or coccolithophores.
  • Description
    Chalk is typically almost pure calcite, CaCO3
  • Article body
    Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity.
  • Article body, building-and-construction
    Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity.
  • Article body, soil-amendment-or-fertilizer
    Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity.
  • Lead section
    Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts of organisms, mostly microscopic plankton, which had settled to the sea floor.
  • Caused By: Sedimentation, Lead paragraph
    Chalk is a soft, white, porous, sedimentary carbonate rock
View the Source
Wikidata: Chalk
Wikidata Q183670
Flint (Wikipedia)
Wikimedia FoundationAssociated With: Flint, Lead section
Quote, Associated With: Flint, Lead section
categorized as the variety of chert that occurs in chalk or marly limestone.
View the Source
Chert (Wikipedia)
Wikimedia FoundationAssociated With: Chert, Lead section, occurrence sentence
Quote, Associated With: Chert, Lead section, occurrence sentence
Where chert occurs in chalk or marl, it is usually called flint.
View the Source
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