miaskite
/ˈmʌɪəskʌɪt/(also miascite) Geology
noun
Any mottled black and white nepheline-syenite that also contains oligoclase, microperthite, and biotite.
Origin
Mid 19th century. From German Miascit from Miask (now Miass), the name of a town on the river Miass in the Urals, where the rock was first obtained + -it -ite.