碳酸盐岩中自生碳酸盐矿物主要为文石、高镁方解石，少量白云石、铁白云石和菱铁矿。
X-ray studies show that carbonate minerals are aragonite, high-Mg calcite, and lesser dolomite, ankerite and siderite.
在自然界，不仅在变质条件下白云石可以从镁方解石中出溶出来，在正常海洋环境中，镁方解石沉积也可被适当压力诱发产生出出溶白云石。
Dolomite can exsolved not only from magnesian calcite under metamorphic conditions, but also from magnesian calcite sediments under a modest pressure in a normal oceanic environments.
有些分泌方解石的生物，会在分泌物中加入镁。
And some calcite-secreting organisms also add magnesium to the mix.
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