A slightly different type of stone made of the minerals magnesium ammonium phosphate, or struvite, can be caused by bacterial infection.
由矿物质磷酸铵镁或鸟粪石制成的结石类型略有不同，可能是由细菌感染引起的。
Ammonium phosphates
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英语百科
Ammonium phosphate
Ammonium phosphate is the salt of ammonium and phosphate. It is a highly unstable compound with the formula (NH4)3PO4. Because of its instability, it is elusive and of no commercial value (except for scientific research). In addition to (NH4)3PO4, a related double salt (NH4)3PO4.(NH4)2HPO4 is also recognized. It too is unstable. The instability of these salts results of their facile decomposition with evolution of ammonia:
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