A rare mineral, a hydrated phosphate of iron and manganese, named after a discoverer or locality.
From the mineralogist Guarini or a place name, plus the mineral suffix -ite (from Greek lithos, 'stone'). This follows the standard convention of naming minerals after people or places of discovery.
Minerals with -ite names can tell you their chemical story—guarinite's iron and manganese content gives it distinctive color properties that would have caught a mineralogist's eye centuries ago.
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