You had a GREAT flush! I know you will see/feel results soon. Schedule another one in a few weeks! Like another person said, increase your water intake to properly hydrate yourself before the flush next time.
People who don't take Epsom Salts still get those green stones. People who use oils other than olive oil still get those green stones. Not every Epsom Salt + oil flush produces stones. Some stones have old dead parasites imbedded in them. Some stones are coated with layers of other materials, which obviously took a lot longer than a few days to form...
When a gallbladder is removed by a surgeon, there are pics of these stones inside the gallbladder when it is cut open (see photos).