1. Calcium carbonate occurs in the allomorphs calcite and aragonite.

2. The unusual exothermal transformation of nacre aragonite to calcite is perhaps resulted from the stored excess enthalpy in nanometer-size aragonite of nacre.

3. X-ray studies show that carbonate minerals are aragonite, high-Mg calcite, and lesser dolomite, ankerite and siderite.

4. Aragonite whiskers were prepared by carbonate process. and the structure properties were analyzed.

5. The acicular and columnar shapes of aragonite crystals are preserved even after aragonite changes into calcite.

6. Aragonite and magnesium calcite are more soluble than normal calcite.

7. Aragonite saturation in the Gulf of Alaska, of which Resurrection Bay is a part, has traditionally extended down to 250 meters[http://], Mathis says.

8. Widely distributed calcite and aragonite crystal in the cave passage are originated from ancient pool deposits.

9. The observation also showed that the each aragonite sheet consists of lesser aragonite sheet fibers.

10. Through the scanning electron microscope (SEM), there are different micromorphology characteristics between vaterite and aragonite on the surface of the pearl sample.

11. The chemical composition of the melo shell is calcite and aragonite.

12. In the paper, the two mineral phases in the freshwater non-nucleated pearl samples are investigated according to the differences of characteristic Raman spectra between the aragonite and vaterite.

13. The results show that the chemical component of the cuttlebone is CaCO_3 and the crystal type is aragonite.

14. The standard X - ray diffraction Fourier pattern of calcium carbonate for Pearl Aragonite mineral aragonite was obtained.

15. It is indicated that the shell is composed of calcite with Rhombohedral structure as well as aragonite with Orthorhombic structure.