Min. Also trok-. [ad. Ger. troktolit (Von Lasaulx, 1875), f. Gr. τρώκτης a kind of sea-fish (taken as = trout) + λίθος stone: see -LITE.] (See quot. 1892.)
1883. Science, I. 342/2. The term ‘troktolite’ is the equivalent of the more common ‘forellenstein.’
1893. Chambers’ Encycl., X. 301. Troctolite (trout-stone), a variety of Gabbro, composed almost entirely of white felspar … and dark olivine.
