In order to investigate calcium carbonate crystals, various kinds of precipitatde CaCO
3 have been obtained by adding (NH
4)
2CO
3 solution to CaCl
2 liquor.
The microscopic observations of developing crystals with regards to the temperature and the density of solutions etc. are as follows.
1) Four kinds of crystals-rhombohedral, globular, flowery and needle have been found.
2) The development of crystals is closely dependent on the temperature and the density of solutions, under which CaCO
3 will be made out.
3) It seems that the above fact is according to the energy contained into the microparticles. and the developing processes of crystals are as follows.
Milky solution→Rhombohedral crystal
_??_Globular↑ crystal_??_Flowery crystal
_??_Needle crystal
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