2.74. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Leucite.
"The Student's Elements of Geology"
Sir Charles Lyell
In mineral composition they scarcely differ from the lavas of Somma, the rock consisting of a base of Leucite and augite, through which large crystals of augite and some of Leucite are scattered.
"The Student's Elements of Geology"
Sir Charles Lyell