diallage

American  

[dahy-uh-lij] / ˈdaɪ ə lɪdʒ /

noun

Mineralogy.

1. a variety of diopside with a laminated structure, found in gabbro and other igneous rocks.

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diallage British  

/ ˈdaɪəlɪdʒ /

noun

1. a green or brownish-black variety of the mineral augite in the form of layers of platelike crystals

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Etymology

Origin of diallage

1795–1805; < French < Greek diallagḗ interchange, change, noun derivative from base of diallássein make an exchange, equivalent to di- di- ³ + allássein to change, exchange

Example Sentences

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.

From Washington Post

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

From Project Gutenberg

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.

From Project Gutenberg

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

From Project Gutenberg

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.

From Project Gutenberg