Chloridric Acid for cleaning Calcium Carbonate deposits on micrometeorites candidates

The particles I find in the sediments from the deep water sometimes look like "dirty". I wondered if this could be a layer of calcium carbonate. 1500 meters deep is quite above the Calcium Carbonate Compensation Depth (CCD). The water is oversaturated in disolved calcium carbonate and this leads to a slow precipitation at the bottom.

A possible solution would be cleaning the micrometeorites candidates with chloridric acid in low concentration. Fortunately the Calcium Carbonate reacts strongly with any acid and produces carbon dioxide (gas) and dissolved calcium chloride.

Here is a first attempt. I see part of the yellowish deposit is actually Calcium Carbonate but it is not only that. Between the strips of this possibly barred olivine micrometeorite, the yellowish/brownish color is apparently not Calcium Carbonate.






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