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Quartz acts as a filler in a body, which means it

  • A.melts first and then bonds the other constituents
  • B.makes the unfired body strong enough to handle
  • C.burns away completely during the firing stage
  • D.remains largely unmelted and controls dimensions

Answer: D

It is refractory at whiteware temperatures and holds the shape while the glass forms around it. Some of it dissolves into the melt at the edges, but the bulk survives as discrete grains. Those surviving grains are why quartz inversion matters on cooling.

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