tho·lei·ite 
(tōlə-īt′, thō-)
(tōlə-īt′, thō-)n.
Any of a series of igneous rocks similar in composition to basalt but having more silica and iron and less aluminum.
[After Tholei (Tholey), municipality in Saarland, Germany, where it is found.]
tho′lei·it·ic (-ĭtĭk) adj.