The green color may possibly be derived from the phosphorous content in the bones. But then again, I don't know crystalline chemistry. One thing's for sure though, they sure made amazingly durable coffins in those times!
it depends. i'll you give 20 buck if you can fill up this crate with your "green mucus membrane" -- of course I'll provide the materials. Up for the challenge, fearless_fx lol. j.k.