Kaolinised

Part of speech: verb, adjective

Definitions

1. Transformed into the white China clay mineral kaolinite through chemical weathering or hydrothermal alteration of feldspar-rich rock
2. Changed by natural decomposition or treatment into the fine white clay known as kaolin, often from granite or other feldspar minerals
3. Having undergone alteration so that feldspar and similar minerals have become the soft white clay material called kaolin

Etymology: Kaolinise is a verb built from "kaolin," the fine white clay used in porcelain. The name of that clay comes from Kao-ling, a hill near Jingdezhen in China, where porcelain makers dug the material. European traders and manufacturers adopted the Chinese name, and English later adapted it into "kaolin," so the word carries the name of a specific Chinese place into the vocabulary of English potters and chemists. To kaolinise something is to transform it into kaolin, or more loosely into the clay-like substance that kaolin represents. The "-ise" ending turns the noun into a verb meaning "to make into" that material, the same pattern found in words like "fossilise" or "crystallise." "Kaolinised" is the past form of that verb, describing rock or mineral that has undergone this alteration, often through the chemical weathering of feldspar.