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What organic materials make up limestone?

What type of mineral and what percent of it determine if a rock is limestone? (Refer to Site 2)

Answer :

Final answer:

Limestone is primarily made up of organic materials including calcium carbonate, derived from marine organisms like coral. In order to be classified as limestone, a rock must contain at least 50% calcite by weight. This specific composition is essential for its identification.


Explanation:

Understanding Limestone Composition

Limestone is primarily composed of organic materials that include calcium carbonate (CaCO3), which is primarily derived from the remains of marine organisms such as coral and foraminifera. Over time, these _organisms_ accumulate and, through natural processes, become compacted and cemented to form limestone. In terms of mineral content, limestone is mainly composed of calcite, which is a crystalline form of calcium carbonate.

For a rock to be classified as limestone, it must contain at least 50% of calcite by weight. The presence and percentage of this mineral is critical in identifying limestone, as it distinguishes this rock type from others that may resemble it in appearance but do not have the same chemical composition.


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