Assertion: precipitated calcium carbonate | /r/HasAspect | sizes of particles
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Source sentences:
text: It is known that precipitated calcium carbonate has various shapes and sizes of particles, and especially, when such precipitated calcium carbonate is used as calcium carbonate, the shape and size of precipitated calcium carbonate can be selected depending on the characteristics required for the intended silica-calcium carbonate composite particles, thus being suited for achieving the purposes of the invention.