Personally I think your post are tending towards trolling as your appear to have the answers to your questions before asking them. Stones that have been expelled by flushing have been sent to a medical analysis lab run by a Ph.D. who heads up the Science Department at Texas Woman's University in Denton. He ran the necessary tests…
"His analysis of the stone sample I sent was 91% cholesterol and the rest was bile salts, water and inert ingredients. In other words, the sample had the chemical contents of gall stones. And the report clearly states it was gall stones"
This information was cribbed from another site by Stephanie Relfe B.Sc
There are pictures of gall bladder with stones in situ that are exactly the same as the stones that are expelled by flushing.
For information on the different types of stones try these pages: