nitratine
/ˈnʌɪtrətiːn/Mineralogy
noun
Native sodium nitrate, NaNO3, crystallizing in the trigonal system and occurring as whitish efflorescences on soil or as granular crusts which are worked as a source of nitrate.
Origin
Mid 19th century; earliest use found in James Nicol (1810–1879), geologist. From German Nitratin from Nitrat + -in.