Low Shrink-Swell China Clay Lump is soft, earthy, usually white mineral produced by the chemical weathering of aluminium silicate minerals like feldspar. The China Clay Lump comes in pink-orange-red colour due to iron oxide, giving it a distinct rust hue. The China Clay Lump feature low shrink-swell capacity and a low cation exchange capacity. The Low Shrink-Swell China Clay Lump can be availed in lighter concentrations yield white, yellow or light orange colours.