A rare mineral containing manganese and other elements, found in metamorphic rocks.
From Greek 'eu' (good/true) + 'lysis' (loosening/dissolution), named because it dissolves readily in acids, making it easy to identify.
Eulysite is one of those minerals that geologists get excited about because its chemistry tells a story about extreme heat and pressure deep underground, and its name literally describes how you identify it—by watching it dissolve.
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