Val, those big tan on the out side stones may have been coated in chaff from the liver. I have had some come out, tan, soft and granular. Sometimes they are all tan, sometimes there's a green stone inside. At any rate they are cholesterol flakes clumped together that need to come out rather than clog up your biliary ducts. Congratulations on a good flush.
BTW-I always use fresh lemon juice in my flushes now. Grapefruit juice seems to cause more nausea. I know that's not the case for everybody, but it is for me. The peppermint is great too; I keep it near all night when flushing.