Calcite sand
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1. A material rich in calcium carbonate, which has the effect of raising the pH of soil as it weathers.
http://slideplayer.com/slide/4181831/14/images/11/LIME+STONE/CALCITE+Limestone+is+a+sedimentary+rock+composed+largely+of+the+mineral+calcite+(calcium+carbonate:+CaCO3).+l..jpg
Limestone is comprised largely of the mineral calcite.
Source: http://slideplayer.com/slide/4181831/