Chlorapatite ( Ca 5 ( PO 4 ) 3 Cl ) is another related structure.
2.
The brightening upwards trend on Ovda Regio is consistent with a ferroelectric signature, and has been suggested to indicate the presence of chlorapatite.
3.
"' Apatite "'is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of PO 4 ) 6 ( OH, F, Cl ) 2, and the crystal unit cell formulae of the individual minerals are written as Ca 10 ( PO 4 ) 6 ( OH ) 2, Ca 10 ( PO 4 ) 6 ( F ) 2 and Ca 10 ( PO 4 ) 6 ( Cl ) 2.
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