Abstract
New types of biological apatites have been discovered in molar sheep and horse teeth and are divided in two types. In the first and more general type, the release of Mg ions is parallel to the changes in composition of apatite leading to a final stoichiometric ratio of Ca to P ions, going from dentin depth towards the boundary of enamel with air. Inside dentin, another apatite sub-types were discovered with alternating layers of Mg-rich and C-rich apatites. The approximate formal stoichiometric relationships for these peculiar types of bioapatites are suggested. We identified two kinds of ion-exchanges responsible for formation of peculiar apatites. Various combinations of main and minor elements lead to new versions of biological apatites.
Highlights
Apatites are very interesting and important minerals [1]
We propose the quantification of results
We have found another peculiar kind of biological apatites, this time occurring only inside the horse and sheep dentins
Summary
Apatites are very interesting and important minerals [1]. They contain ions of several main elements and chemical groups such as Ca2+ , PO4 3− , Cl− , F− , OH− , and consist of many minor components. These apparently less important additions sometimes significantly change the features of original minerals. There are still controversies about the amount and the way in which Mg is involved in the apatite. The averaged amounts of Mg are important, since Robinson et al
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