A rare black iron silicate mineral, typically found in silica-poor igneous rocks.
From 'aenigma' (riddle) + '-ite' (mineral suffix), named because its chemical composition was initially mysterious and difficult to determine when first discovered by mineralogists.
This mineral got its name because scientists were genuinely puzzled by what it was made of—it's a beautiful example of how mineralogy preserves the history of confusion, like giving a rock a name that means 'mystery rock.'
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