[cogitator]

No. 2 is the Hershey mine.... Let's give everyone a clue-- nyerereite and gregoryite are the principle minerals in this type of pyroclast.

Hadn't heard it referred to as the Hershey mine, but the mineral names pretty much nail it down.

[ijcr]

Twisted sense of humour...I was referring to the Pennsylvania chocolate mines,I apologise.They made sit through a slideshow of a field trip to Tanzania while my weeks pay was running on the race course at the bottom of the university grounds. Imperial College Geo-Physics was next to Ascot.