Editing Calcium carbonate (section)

=== Crystal structure ===
The [[calcite]] crystal structure is [[trigonal]], with [[space group]] R{{overline|3}}c (No. 167 in the International Tables for Crystallography<ref>{{cite book | title=International tables for crystallography. | publisher=International Union of Crystallography | publication-place=Chester, England | date=2006 | isbn=978-0-7923-6590-7 | oclc=166325528 | doi = 10.1107/97809553602060000001| s2cid=146060934 | editor-last1=Welberry | editor-first1=T. R}}</ref>), and [[Pearson symbol]] hR10.<ref>{{Cite journal |last1=Chessin |first1=H. |last2=Hamilton |first2=W. C. |last3=Post |first3=B. |date=1965-04-01 |title=Position and thermal parameters of oxygen atoms in calcite |url=https://scripts.iucr.org/cgi-bin/paper?S0365110X65001585 |journal=Acta Crystallographica |volume=18 |issue=4 |pages=689–693 |doi=10.1107/S0365110X65001585 |bibcode=1965AcCry..18..689C |issn=0365-110X |access-date=15 December 2022 |archive-date=15 December 2022 |archive-url=https://web.archive.org/web/20221215201234/https://scripts.iucr.org/cgi-bin/paper?S0365110X65001585 |url-status=live}}</ref> [[Aragonite]] is [[Orthorhombic crystal system|orthorhombic]], with space group Pmcn (No 62), and Pearson Symbol oP20.<ref>{{Cite journal |last=Negro |first=AD |date=1971 |title=Refinement of the crystal structure of aragonite |url=http://www.minsocam.org/ammin/AM56/AM56_768.pdf |journal=American Mineralogist: Journal of Earth and Planetary Materials |volume=56 |pages=768–772 |via=GeoScienceWorld |access-date=15 December 2022 |archive-date=15 December 2022 |archive-url=https://web.archive.org/web/20221215200845/http://www.minsocam.org/ammin/AM56/AM56_768.pdf |url-status=live}}</ref> [[Vaterite]] is composed of at least two different coexisting crystallographic structures. The major structure exhibits [[Hexagonal crystal family|hexagonal]] symmetry in space group P6<sub>3</sub>/mmc, the minor structure is still unknown.<ref>{{Cite journal |last1=Kabalah-Amitai |first1=Lee |last2=Mayzel |first2=Boaz |last3=Kauffmann |first3=Yaron |last4=Fitch |first4=Andrew N. |last5=Bloch |first5=Leonid |last6=Gilbert |first6=Pupa U. P. A. |last7=Pokroy |first7=Boaz |date=2013-04-26 |title=Vaterite Crystals Contain Two Interspersed Crystal Structures |journal=Science |volume=340 |issue=6131 |pages=454–457 |doi=10.1126/science.1232139 |pmid=23620047 |bibcode=2013Sci...340..454K |s2cid=206546317 |issn=0036-8075}}</ref>