'feldspar-bearing' is a modern English compound formed from 'feldspar' + 'bearing'. 'Feldspar' originates from German, specifically the word 'Feldspat', where 'Feld' meant 'field' and 'Spat' (related to 'spar') referred to a crystal/rock (a mineral). 'Bearing' originates from Old English 'beran', meaning 'to carry' or 'to bear'.

'feldspar' entered English in the 19th century from German 'Feldspat'; 'bearing' comes from Old English 'beran' and developed into the modern participial adjective 'bearing'. The compound 'feldspar-bearing' arose in modern geological usage to describe rocks that 'carry' or contain feldspar.

Initially, 'Feldspat' referred to a rock/mineral name in German and 'beran' meant 'to carry'; combined in English the phrase came to mean 'containing feldspar' and has retained that technical geological sense.