Do all calcified stones sink?

Is it possible that some calcified stones will float?
I didn't use a colander, but looking at what was floating in the toilet after my second Liver Flush (Andrea Moritz method), I released about a cup full of yellowish tan stones that looked like small pieces of pumice. They looked just like the pictures of calcified stones. The largest was an inch and a half in diameter. They all floated.
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