The fossils buried in Pleistocene and earlier ocean sediments were of foraminifera—small, single-celled marine organisms that secrete shells of calcium carbonate, or calcite.
在更新世和更早的海洋沉积物中埋藏的化石生物属于孔虫类生物，它们是微小的单细胞海洋生物，其分泌的硬壳由碳酸钙和方解石组成。
The protein converts calcium carbonate into calcite crystals which makes up the egg shell, creating six grammes of shell every 24 hours.
这种蛋白将碳酸钙转换为构成蛋壳的方解石晶体，每24小时生成6克蛋壳。
In the shell, mineral form of calcium carbonate is calcite and aragonite.
贝壳中的碳酸钙是以文石和方解石形式存在。
Calcite or marble is crushed, graded, and surface treated to be all kinds of technical natural calcium carbonate with different fineness. It is widely used in rubber, plastic, paint, and paper.
以方解石、大理石经超细粉碎、分级得到系列不同细度的重质碳酸钙，再经表面处理制得重质活性碳酸钙。
Heavy calcium carbonate coarse whiting, which is made of natural calcium carbonate minerals such as calcite, marble grinding.
重质碳酸钙简称重钙是由天然碳酸钙矿物如方解石、大理石磨碎而成。
The calcium ion which induced dissolution turned to calcite then settled as sediment and also accelerated the decomposition process of sulfate mineral by SRB.
新生矿物方解石的形成说明在分解过程中可以发生固碳反应，减少温室气体的排放。
In its compounds calcium has valence 2. It occurs in limestone, chalk, marble, dolomite, eggshells, pearls, coral, and many marine shells as calcium carbonate, or calcite;
钙以方解石（碳酸钙）的形式存在于石灰岩、白垩、大理石、白云石、蛋壳、珍珠、珊瑚、钟乳石、石笋和许多海洋动物的壳体中。
In its compounds calcium has valence 2. It occurs in limestone, chalk, marble, dolomite, eggshells, pearls, coral, and many marine shells as calcium carbonate, or calcite;
钙以方解石（碳酸钙）的形式存在于石灰岩、白垩、大理石、白云石、蛋壳、珍珠、珊瑚、钟乳石、石笋和许多海洋动物的壳体中。
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