Use a slightly different temperature for how cool the surface of the Earth is, for instance, and suddenly an apatite crystal
might look like it's been buried for much longer.
Indeed, abundant apatite crystals
were identified in the lumens of loops of Henle.
showed a calcium phosphate rich interface layer with apatite crystals
grown on solid state reaction between glass ceramic and bone.
Dental enamel is arranged in the form of hexagonal apatite crystals
Their simulations revealed that the unusually hydrogen-rich apatite crystals
observed in many lunar rock samples may not have formed within a water-rich environment, as originally thought.
It found that theobromine increased the size of the apatite crystals
which form tooth enamel.
The aim of this study was therefore to investigate the feasibility of fabricating nano-size and needle-like shape HAP crystals at low temperature, mimicking the morphology and size of bone apatite crystals
The reduction in specific surface area resulting from calcination is due to both growth of apatite crystals
and sintering of crystals, the latter being a consequence of adhesion of particles by expansion of interfacial contact points to form bonded aggregates (Kuczynski 1965).