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After correctly spelling back-to-back German-derived words — Kneippism and schlieren — he was knocked out by diallage, a dark green or bronze-colored laminated pyroxene common in certain igneous rocks.

Gabbro, gab′ro, n. a rock composed of feldspar and diallage—also Euphotide.—n.

Diallage, dī′al-āj, n. a mineral nearly allied to augite, brown, gray, or green in colour, laminated in structure, with a metallic lustre when broken across.—adjs.

In some gabbros and norites reaction rims of fibrous hornblende are found around both hypersthene and diallage where these are in contact with felspar.

These basic holocrystalline rocks form a large and numerous class which can be subdivided into many groups according to their mineral composition; if we take it that typical gabbro consists of plagioclase and augites or diallage, norite of plagioclase and hypersthene, and troctolite of plagioclase and olivine, we must add to these olivine-gabbro and olivine-norite in which that mineral occurs in addition to those enumerated above.