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

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

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World English Dictionary
diallage (ˈdaɪəlɪdʒ)
a green or brownish-black variety of the mineral augite in the form of layers of platelike crystals
[C19: from Greek diallagē interchange]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The diallage has been altered largely to a lamellar variety of serpentine which possesses a silvery-gray color and a silky lustre.
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