Pitlamp said:Thanks - I think the last time I was in the Burtersett Mines was before snottites were identified / named!
What I do remember though was small almost transparent (water soluble) crystals with a greenish tinge emerging from the shales in there. I remember at the time deciding they were likely to be iron sulphate. If that's right - and there's sulphur minerals knocking about, that'd be compatible with snottite formation.