A calcium carbonate mineral. There are often iron, manganese, and occasional incorporation of zinc, nickel and cobalt. Trigonal crystals. The crystal is often rhombohedral and has a saddle shape due to the curvature of the crystal plane. The aggregates are soft, dense, granular, and kidney-like. Generally grayish white; sometimes yellowish, slightly brown, light green; a few can also have a variety of brilliant colors, such as Czech has a cobalt containing (coco3 up to 7.5%) dolomite is red. Transparent - slightly transparent. Glass - pearl luster. One axis negative crystal. The refractive index is no. 1.679 to 1.703, ne = 1.500 to 1.520, and the folding ratio is 0.179 to 0.185. Strong dispersion. Hardness 3.5 to 4. The three sets of diamonds have complete cleavage, but the cleavage planes are mostly curved with a relative density of 2.8 to 2.9. In case of dilute hydrochloric acid decomposition, foaming is less than calcite. Like calcite, dolomite is also an important rock-forming mineral, mainly for external genesis, and is a sediment in the lagoon basin. In the early Earth environment, sedimentary genes have more dolomite than limestone.
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