chalk

Image credit: James St. John

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mineral precipitates

CaCO3

fossiliferous limestone coquina oolite travertine

limestone breccia micrite chalk

(Ca,Mg)(CO3)2 dolostone

SiO2 diatomite chert

Fe2O3 ironstone

clastic

conglomerate breccia sandstone shale

organic carbon

peat lignite bituminous coal anthracite

chalk

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Resources: chalk

Image Galleries

• Google images: chalk

Other Resources

• Mindat.org: About chalk

• Sandatlas: many types of limestone