Tricalcium phosphate has three recognised polymorphs, the rhombohedral β- form (shown above), and two high temperature forms, monoclinic α- and hexagonal α'-. β-tricalcium phosphate has a crystallographic density of g cm −3 while the high temperature forms are less dense, α-tricalcium phosphate has a density of g cm −3 and α'-tricalcium phosphate has a density of g cm −3 All forms have complex structures consisting of tetrahedral phosphate centers linked through oxygen to the calcium ions.  The high temperature forms each have two types of columns, one containing only calcium ions and the other both calcium and phosphate. 
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