In geology and chemistry, relating to or containing iron and magnesium compounds; characterized by a high proportion of dark minerals.
From 'ferric' and 'magnesium' compressed and blended into 'femic.' This scientific coinage emerged in geology and mineralogy during the late 19th century.
The word 'femic' shows how scientists are excellent at creating efficient technical vocabulary—they took parts of 'ferric' and 'magnesium' and fused them into one neat adjective to replace a clumsy phrase.
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