misenite
/ˈmiːzənʌɪt/ /ˈmɪsənʌɪt/(also misénite) Mineralogy
noun
A monoclinic acid sulphate of potassium occurring as greyish-white, transparent or translucent, fibrous masses or aggregates of needle-like crystals.
Origin
Mid 19th century; earliest use found in James Dana (1813–1895), geologist, zoologist, and teacher. From Italian misenite from Miseno, the name of a promontory near Naples, where the mineral was first found + -ite.