What is "melanophlogite"

n. (context mineralogy English) A tetragonal-ditetragonal dipyramidal mineral containing carbon, hydrogen, oxygen, silicon, and sulfur.

Melanophlogite (MEP) is a rare silicate mineral and a polymorph of silica (SiO). It has a zeolite-like porous structure which results in relatively low and not well-defined values of its density and refractive index. Melanophlogite often overgrows crystals of sulfur or calcite and typically contains a few percent of organic and sulfur compounds. Darkening of organics in melanophlogite upon heating is a possible origin of its name, which comes from the Greek for "black" and "to be burned".