Plural of diallage; multiple specimens or samples of this iridescent pyroxene mineral.
Regular plural formation of diallage (Greek diallassein + -age). The -s ending creates the plural, a standard pattern for English nouns.
Geologists collecting 'diallages' are after some of the prettiest specimens in rock collections—the mineral's bronze-to-green metallic shimmer makes them prized by both scientists and mineral enthusiasts.
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