This needs clarifying:
(Note that I agree with Percy that the composition of limestone might need to be off this thread but...
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(Note 2: It appears that there is no arguement from AIG(at least) about the composition of limestone. They agree it is micro fossils in large part.
Can Flood Geology Explain Thick Chalk Beds?
| Answers in Genesis
The argument now becomes, in part, with the calculations presented there.)
much limestone is also comprised of recrystalized (during diagenesis) calcite, micritic calcite, sparry calcite, and broken shells too small to see. Micrite is so minute it appears black in thin-section, sparry calcite is coarser grained calcite. In addition, the algae itself precipitates carbonate as mud, so not all carbonate or calcite will look like little shell
When you say "much limestone" -- do you mean much of a particular sample (that is it is microfossils in a recrystalized matrix) or do you mean that some limestones have few or no microfossils and are, in bulk, made up as you describe with no clear sign of their orgainic origins. Does that mean that they may not be organic in origin?
What is diagenesis?
In addition, the algae itself precipitates carbonate as mud, so not all carbonate or calcite will look like little shell
Can you describe this in more detail please?
calcite, micritic calcite, sparry calcite, and broken shells too small to see
Can you still, with a microscope, determine the origin of that particular limestone?