mariposite
/marɪˈpəʊsʌɪt/Mineralogy
noun
A variety of phengite (muscovite) that contains a relatively high proportion of silica and some chromium and is found as green or greenish-yellow crystals.
Origin
Mid 19th century; earliest use found in Benjamin Silliman. From the name of Mariposa county, California + -ite.