球文石是碳酸钙的同质多象变体，最不稳定，很少在自然界出现。
By optical microscope, vaterite , a very unstable polymorphism of calcium carbonate, which rarely appears in nature, has been discovered.
结果发现，淡水珍珠物相组成与海水珍珠不同；并首次在淡水无光珠中发现了球文石。
The results show that the mineral compositions of fresh water pearl are different from that of sea water pearl, and vaterite has been discovered.
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