pimelite
/ˈpɪmɪlʌɪt/ /ˈpɪm(ə)lʌɪt/Mineralogy
noun
A green mineral of the smectite group that is a hydrated basic nickel silicate and belongs to the hexagonal crystal system.
Origin
Early 19th century. From German Pimelit from ancient Greek πιμελή fat + German -it, so called on account of the greasy appearance and feel of the mineral.