darapskite
/ˈdarəpskʌɪt/ /dəˈrapskʌɪt/Mineralogy
noun
A colourless or white mineral of the monoclinic crystal system which is a double nitrate and sulphate of sodium, Na3(NO3)(SO4)·H2O, occurring as prismatic and tabular crystals in nitrate and saline deposits.
Origin
Late 19th century; earliest use found in American Naturalist. From the name of Ludwig Darapsky, Chilean chemist and mineralogist + -ite, after German Darapskit.