A common mineral found in metamorphic and igneous rocks, typically yellow-green or brownish in color, composed of calcium, aluminum, and iron silicates.
From Greek 'epidosis' (increase/addition) because the mineral has an extra atom compared to similar minerals. The term was coined in early 19th-century mineralogy.
The name 'epidote' comes from Greek for 'increase'—scientists named it this way because it has one extra atom compared to a similar mineral, which is a pretty clever naming strategy!
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