If someone tried to put up something like 'a calcium atom from an animal bone' no-one'd ever get it and they'd be seriously looked down upon in future. I don't know how many bob's that was. Maybe Bob (the dog) knows best.
Agree with all above. Also, from experience, when In The Chair - it's worth considering how attentive you can be for the following few days. DrQ's 'mineral' moved along fairly swiftly, even though there were plenty of questions - all down to the fact that he was 'here' and could reply quickly. Ten bob please.