Explanatory notes
… clays), quartz, feldspar (or feldspathoïds), and sometimes calcium carbonate. It is covered with a colourless … Bone china, which contains less alumina, contains calcium phosphate (e.g., in the form of bone ash); a … include : (1) Pottery made from common ferrugineous and calcareous clay (brick earth). It has a dull earthy texture …
