|Coal scrubber residue.|
This sulfur is waste from the desulfurization of coal. From the eBay listing:
Sulfur from a desulfurization unit at a southwestern Pennsylvania coke plant. Specimen is approximately 7.9 x 2.2 x 1.0 cm. Sulfur is recovered from coke oven gas by reacting hydrogen sulfide with sulfur dioxide. Nearly pure elemental sulfur results from this environmentally friendly process. Sulfur stalactites and stalagmites form around leaking valves.As industrial waste goes, this stuff is quite pretty.
Source: eBay seller smektar
Contributor: Theodore Gray
Acquired: 10 April, 2004