tholeiite

tholeiite |ˈθəʊlɪʌɪt | ▶noun [ mass noun ] Geology a basaltic rock containing augite and a calcium-poor pyroxene (pigeonite or hypersthene ), and with a higher silica content than an alkali basalt. DERIVATIVES tholeiitic |ˌθəʊlɪˈɪtɪk |adjective ORIGIN mid 19th cent.: from Tholei, the name of a village (now Tholey ) in the Saarland, Germany, + -ite 1 .

tholeiite

tholeiite |ˈθəʊlɪʌɪt | ▶noun [ mass noun ] Geology a basaltic rock containing augite and a calcium-poor pyroxene (pigeonite or hypersthene ), and with a higher silica content than an alkali basalt. DERIVATIVES tholeiitic |ˌθəʊlɪˈɪtɪk |adjective ORIGIN mid 19th cent.: from Tholei, the name of a village (now Tholey ) in the Saarland, Germany, + -ite 1 .