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It is calcite. On the left side of the rock you can see the parallel cleavage planes running through the specimen. Quartz does not cleave like that. This is calcite.

You can use it for making cement, stucco or in any manufacturing process where calcium is required. 

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Try the hardness test.  Draw a small piece of quartz across the sample in question.  If it leaves a scratch, the sample is Calcite, if not, then its probable Quartz.

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