| Also, aragonite tends to have much higher amounts of strontium as a trace element in the calcium carbonate. |
| Thus calc spar is a common name for calcite, heavy spar for barite, needle spar for aragonite, and so on. |
| Coral's hard parts are composed of aragonite, a form of calcium carbonate. |
| Many limestones are rich in aragonite, but this in course of time tends to recrystallize as calcite. |
| Strontium concentrations in seawater reflect the diagenesis of Sr-rich aragonite to calcite on continental shelves. |
| Otoliths consist of calcium carbonate, mainly in the form of aragonite, and organic matter called otoline. |
