How literal is this phrase?

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china clay:

Definitions:

  1. a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper)

Examples:

  1. the ' lunar ' qualities of the landscape , dramatically shaped by the working of china clay , forming peaks and platforms of waste sand and pits often flooded with turquoise green
  2. , turning Newquay from a fishing to a commodity port loading tin , lead and china clay . The famous six-oared gigs you can watch in harbour races originally competed to put
  3. . Prepare to be astounded by the scale of this attraction built in an old china clay pit . Local Attractions : * Golf - Reduced fee * Tennis * 1 mile
  4. many of the Danish vessels he painted in Goole also called at that port for china clay . First of the ships are those of the Humber which Chappell painted while in
  5. coal , metallic and non-metallic minerals ( e.g. sand , gravel , ball clay , china clay , potash , fluorspar , barytes , silica sand and fuller 's earth ) .

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