This is a huge 7-pound SINGLE CRYSTAL of willemite! It would therefore rank fairly high among all the many crystals found here, I think, for its sheer size and remarkable completeness. The crystal is nestled in a bit of calcite matrix, and the fluorescence of green-on-red is, as you would expect for this material, quite impressive. I have seen many Franklin collections over the years, and only a few crystals approaching this magnitude. It is very likely an old specimen, but its impossible to say how old. from the collection of Robert Whitmore