In July 1819 Edward Daniel Clarke, Professor of Mineralogy at the University of Cambridge, reported the find of "Green Fluor Spar, of very uncommon Beauty, and with remarkable properties of Colour and Phosphorescence" from the Middlehope Shields Mine.

He noted that "the rider of the vein .. is a buff coloured magnesian limestone .." as seen in the present specimen.

See: http://westgarthforster.blogspot.com/2014/11/glorious-green-fluorite-from-middlehope.html?view=magazine