Containing, composed of, or resembling feldspar; used to describe rocks rich in feldspar minerals.
From 'felspar' or 'feldspar' with the adjectival suffix '-ic,' meaning 'of or relating to.' This term became standard in 19th-century geology to describe rocks classified by their feldspar content.
When a geologist says a rock is 'felspathic,' they've essentially identified its biggest ingredient—like saying a cake is 'buttery' because butter is the dominant flavor component.
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