Learn how to say Troctolite correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word troctolite:
[mass noun] Geology
gabbro made up mainly of olivine and calcic plagioclase, often having a spotted appearance likened to a trout’s back.
late 19th century: from German Troklotit, from Greek trōktēs, a marine fish (taken to be ‘trout’)