Assertion: calcium carbonate's form | /r/HasProperty | chalk
Facets:
Source sentences:
text: Its most common natural forms are chalk, limestone, and marble, produced by the sedimentation of the shells of small fossilized snails, shellfish, and coral over millions of years.
text: Calcium carbonate's most common natural forms are chalk, limestone, and marble.
text: Its most common natural forms as the minerals sedimentary rocks are chalk, limestone, marble, calcite, aragonite and limestone.