'feldspathic' originates from the German word 'Feldspat,' where 'Feld' meant 'field' and 'Spat' meant 'a rock or mineral that can be easily split.'

'Feldspat' transformed into the English word 'feldspar,' and eventually became the adjective 'feldspathic' to describe rocks containing feldspar.

Initially, it meant 'related to feldspar,' and this meaning has largely remained the same in modern usage.