Where can I get some tetracalcium phosphate?

checked sigma-aldrich.. but nothing.. help?

Answer:
tetracalcium phosphate is Ca4O9P2, the calcium salt of metaphosphoric acid. It looks like it is not very easy to get ahold of. I looked it up on CAS Registry and was not able to locate a commercial supplier that way. I then looked up a synthesis, and you're supposed to heat an equimolar mixture of dicalcium phosphate and calcium carbonate at 1500°C for 6 h. That doesn't sound like something most ordinary people are equipped to do. Doesn't sound very safe either.

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