Summary
Comparison of lattice parameters and morphology of some of the microcrystallites in a subcutaneous heterotopic calcification reported by Daculsi et al. [1] with those of heat-treated octacalcium phosphate (OCP) suggests that OCP is one of the mineral phases in dense globules and one of the precursors for the apatite.
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Tung, M.S., Brown, W.E. The role of octacalcium phosphate in subcutaneous heterotopic calcification. Calcif Tissue Int 37, 329–331 (1985). https://doi.org/10.1007/BF02554883
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DOI: https://doi.org/10.1007/BF02554883