Discussion
Nepheline syenite is used in place of feldspar because it
Answer: B
Correct answer: melts at a lower temperature for the same effect
Nepheline syenite carries a higher total alkali content than feldspar and almost no free quartz, so it forms its melt some 50 to 100 degrees lower. Substituting it lets the same degree of vitrification be reached at a lower temperature, saving fuel and kiln time - which is why it is used wherever a fast, low firing cycle is wanted.
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