dolomite vs sand for concrete mix,
Dolomite - Wikipedia
Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate, . Dolomite is used as an ornamental stone, a concrete aggregate, and a source of . In horticulture, dolomite and dolomitic line are added to soils and soilless potting mixes as a pH buffer and as a magnesium source.