One of the mysteries of the English language finally explained.
A form of silica with a clathrate structure containing organic impurities, which crystallizes in the tetragonal system and occurs as minute cubic crystals or thin crusts on sulphur.
Late 19th century; earliest use found in Nature: a weekly journal of science. From German Melanophlogit from melano- + ancient Greek ϕλογ-, ϕλόξ flame + -it, after the black colour of the mineral when heated.
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