'feldspar-rich' originates from the combination of 'feldspar,' a group of rock-forming minerals, and 'rich,' meaning abundant or plentiful.

'Feldspar' comes from the German word 'Feldspat,' where 'Feld' means 'field' and 'Spat' means 'a rock that does not contain ore.'

Initially, 'feldspar' referred to a specific mineral group, and 'rich' meant abundant. Together, they describe a material with a high concentration of feldspar.