Ditto on the perlite.
Check your Yellow Pages for pottery/ceramic supply dealers. That might give you a lead on the fire clay.
I'm pretty sure that the silica content of sand will vary. Some of it is just really fine rock. Not sure where to go on that one.
Don
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Behold, I have created the blacksmith
Who blows the coals in the fire,
Who brings forth an instrument for his work;...
Isaiah 54:16
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