A dark igneous rock that is produced by alteration of diorite, containing epidote as a key mineral component.
From Greek 'epi' (upon/from) + 'diorite' (type of igneous rock). This mineralogical term emerged in 19th-century geology to describe altered dioritic rocks.
Rocks transform over time—epidiorite is literally diorite that's been altered by heat and pressure—it's like the rock equivalent of metamorphosis!
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