calcite

方解石英释中释na colourless or white mineral (occasionally tinged with impurities), found in sedimentary and metamorphic rocks, in veins, in limestone, and in stalagmites and stalactites. It is used in the manufacture of cement, plaster, paint, glass, and fertilizer. Composition: calcium carbonate. Formula: CaCO3. Crystal structure: hexagonal (rhombohedral)

1 His team analysed mud samples from Lough Monreagh in Ireland and discovered layers of white sediment made up of calcite crystals from algae..他的团队分析了爱尔兰洛蒙雷阿湖泥浆样本，发现了由海藻中方解石晶体构成的白色沉淀物涡旋层。

2 We then used a quartz calcite, which has an effect on light that depends on the direction the light is propagating, to measure the direction as a function of position..然后，我们用石英方解石测量作为位置函数的方向，石英方解石对光的影响这取决于光线的传播方向。

3 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。