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三斜系统。它通常是层状，放射状或纤维状的聚集体。白色略带灰色。玻璃光泽，劈裂面有珍珠光泽。硬度为4.5〜5.0。硅灰石的组成是Ca3（Si3O9）。平行于{100}的分裂裂完成，平行于{001}介质，分裂分裂面相交角为74°。密度2.78〜2.91 g / m3 它主要在酸性渗透岩和石灰岩的接触变质带中产生，这是矽卡岩的主要矿物成分。在一些深变质岩中也发现了它。利用造纸，陶瓷，水泥，橡胶，塑料等的原料或填料。气体过滤材料和隔热材料；冶金焊剂等
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