Replacement by calcite is very rare. The original shell material would ... (a nodule of well-cemented sediment in the middle of a relatively uncemented sedimentary rock). Indeed, the critter probably ...

Calcite and other minerals gradually cemented ... Eventually, coastal erosion liberated these concretions from the enclosing sedimentary rock, leaving them scattered along Koekohe Beach.

Limestone, for example, is a sedimentary rock made exclusively of the mineral calcite (CaCO3). Glacier ice too, is a type of rock composed of crystals of water. In 2014, scientists proposed naming ...

Since the early 1980s, quasi-seasonal cycles of phytoplankton blooms have induced calcite precipitation, leaving distinct laminations in the sedimentary record. These “whiting events” evidently did ...