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Potash feldspar and soda feldspar differ in that soda feldspar

  • A.is not a feldspar at all in the proper sense
  • B.melts at a lower temperature over a narrower range
  • C.melts at a higher temperature over a much wider range
  • D.contains no alkali metals at all in its structure

Answer: B

The sodium form gives a more fluid melt that begins sooner, while the potassium form gives a more viscous one over a wider interval. Potash is generally preferred where firing range matters, which is most of the time in production.

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