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It is one of the softest minerals on Earth. It is used as construction stones and is one of the inert coloring ingredients of paint.
Calcite (CaCO3) tastes like salt when you lick it and it has what is called "birefringence" which means that it refracts light traveling through the crystal in two orientations causing a double-image effect of anything that is viewed through a perfect crystal.

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9y ago

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