A mineral or rock composed primarily of garnet, or a type of garnet-rich metamorphic rock.
From 'granat' (garnet) + -ite suffix (mineral name ending); follows the systematic naming conventions of mineralogy where -ite indicates mineral composition.
The '-ite' suffix is the mineralogist's signature—it's added to root words to create new mineral names, so 'granatite' immediately tells a geologist this is a rock primarily made of garnets.
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