Microspar - how is it formed?

Question

It's generally known that it forms by aggrading neomorphism but not everyone believes. Does anyone think it can be formed directly from organic or inorganic precipitation? For those who are familiar with this area in geology, please let me hear what you think

Answer 1

Of the processes grouped under neomorphism, inversion of aragonite to calcite is probably the most important and easiest to identify. True calcite to calcite recrystallization is probably rare, although it is certainly important in some localities. Neomorphism of carbonate mud to microspar, etc., is very common-- neomorphism is the proper word here because one does not know if the original mud was aragonite (most likely) of or calcite.

Answer 2

It is often formed by fracture of large crystals or nucleation.