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Melilite Group Smelter Ore From Houghton, Michigan. The exact smelter is unknown, but these very unique specimens are hard to come by and a must have for slag collectors. Very fragile, which is shown by glu and styrofoam.This specimen:
measures - approximately 7.4x4.5x4.8cm
weighs - 50 grams
ships - unmounted, no base. I will pack well, but small needles will break off.