mascagnite
/ˈmaskənjʌɪt/Mineralogy
noun
Ammonium sulphate occurring as colourless, grey, or yellowish crystals of the orthorhombic system, usually in translucent crusts formed as sublimation products of volcanoes and burning coal seams, and in Peruvian guano.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From mascagn- + -ite.