Clay-feldspar-quartz porcelains are referred to as triaxial whiteware.
Amigó B, Vicente, Delvasto A, Silvio, Sánchez V, Enrique, Guzmán A, Álvaro 2013, 'Cenizas del tamo de arroz como substituto del feldespato en la fabricación de cerámicablanca', Boletín de la Sociedad Española de Cerámica y Vidriohttp://ceramicayvidrio.revistas.csic.es/index.php/ceramicayvidrio/article/view/1177/1211. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
These clays are used in both whiteware ceramics and paper filler.
Ian Richard Wilson, Helena de Souza Santos, Pérsio de Souza Santos 1998, 'Caulins brasileiros: alguns aspectos da geologia e da mineralogia Brazilian kaolins:some aspects of the geology and mineralogy', Cerâmicahttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131998000400003. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)