Wiktionary
boussingaultite
n. (context mineral English) A monoclinic-prismatic mineral containing hydrogen, hydrogen, magnesium, nitrogen, oxygen, and sulfur.
Wikipedia
Boussingaultite
Boussingaultite is a rare sulfate mineral of the chemical formula: (NH)Mg(SO)·6(HO). The formula of boussingaultite is that of Tutton's salts type. It was originally described from geothermal fields in Tuscany, Italy, where it occurs together with its iron analogue mohrite, but is more commonly found on burning coal dumps. The mineral possess monoclinic symmetry and forms clear, often rounded crystals.
The mineral is named after the French chemist Jean-Baptiste Boussingault (1802–1887).