Resembling diallage in appearance or properties; similar in look or characteristics to diallage mineral.
From diallage + -oid (suffix meaning resembling or similar to). The -oid suffix allows comparison of minerals without asserting they are chemically identical.
When geologists find a mineral that looks like diallage but isn't quite the same chemically, they call it 'diallagoid'—it's like saying 'this looks like diallage's cousin' without committing to exact classification.
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