alnöite
/ˈalnəʊʌɪt/(also alnoite) Geology
noun
A dark, alkaline, intrusive igneous rock chiefly composed of augite, biotite, and olivine phenocrysts in a groundmass of augite and melilite.
Origin
Late 19th century; earliest use found in Nature: a weekly journal of science. From Alnö (commonly, with suffixed definite article, Alnön), the name of a Swedish island + -ite, after German Alnöit.