pickeringite
/ˈpɪk(ə)rɪŋʌɪt/Mineralogy
noun
A mineral that is a monoclinic hydrated sulphate of aluminium and magnesium, MgAl2(SO4)4.22H2O, occurring as transparent or translucent, usually whitish, aggregates of fibrous or acicular crystals.
Origin
Mid 19th century. From the name of John Pickering, American philologist + -ite.