Yes, it is possible to crystallize HAP from a precipitation technique. but it will be a primary nucleation, not homogeneous nucleation due the presence of the walls of the vessel that induces the formation of the solid. Homogeneous nucleation in crystallization systems is more difficult to happen. Both are stochastic process that means you cannot control or reproduce it well.

See

Influence of process conditions on hydroxyapatite crystallinity obtained by direct crystallization

• April 1999
• Materials Research 2(2)
• DOI:10.1590/S1516-14391999000200003

Dear SILAS DERENZO ,

Thank you for the information.

yours,

Panagiotis

Dear Panagiotis, thank you for posting very his interesting technical question on RG. In addition to the relevant literature reference suggested by SILAS DERENZO please also have a look at the following potentially useful articles which might help you in your analysis:

Preparation of large-sized hydroxyapatite single crystals using homogeneous releasing controls

Article Preparation of large-sized hydroxyapatite single crystals us...

This article is freely available as public full text on RG so that you can download it as pdf file.

Good luck with your research!

Dear Frank T. Edelmann ,

Many thanks for your reply!

Best wishes,

Panagiotis