Describing something that contains diopside or has properties similar to diopside.
From diopside plus the suffix '-ic' (relating to or characterized by), a standard English adjectival formation added to mineral names to create descriptive adjectives.
Geologists use '-ic' endings constantly to turn mineral names into adjectives—it's like adding '-y' in English, so 'diopsidic rocks' just means 'rocks that have diopside in them.'
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