Minium is a rare secondary alteration product of lead. This yellowish-green to orangish to brick-red specimen is solid minium, either as microcrystals or in massive form. Lead microcrystals, as discrete crystals or as clusters or masses are richly scattered on the 3-dimensional mounded matrix on this rare mineral from a very uncommon Utah locality - the iron mines near Cedar City. The largest lead crystal is 5 mm. The iron mines operated from 1851 through the 1980s. Ex Charles Hansen Collection. Hefty for the size (lead, of course) at 450 grams or 15.8 ounces.