The hardness test is key to diagnosis of factitious calcium carbonate stones.

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@article{McGing2014TheHT, title={The hardness test is key to diagnosis of factitious calcium carbonate stones.}, author={Peadar G McGing and Keith J. Mulready and Desmond McGoldrick}, journal={Annals of clinical biochemistry}, year={2014}, volume={51 Pt 1}, pages={115-6} }