Dolomite Mineral Characteristics
Crystal system: Trigonal system.
Crystal habit: rhombohedron, often in the form of massive aggregates.
Common colors: colorless, white, with yellow or brown tones.
Gloss: Glass luster to pearl luster.
Cleavage: Dolomite has three sets of complete cleavage.
Mohs hardness: 3 ~ 4 .
The density is 2.86 g/cm~3.20 g/cm.
The word Dolomite is mainly used to commemorate a French chemist DOLOMIEU (1750~1843). Dolomite is a trigonal system with a chemical composition of CaMg(CO3)2, which is mainly composed of calcium carbonate and magnesium carbonate (the ratio of CaCO3 to MgCO3 is 1:1). It has a complete solution. And rhombohedral crystal. The color is mostly white, gray, flesh, colorless, green, brown, black, dark pink, etc., transparent to translucent, with glass luster, hardness 3.5-4, specific gravity 2.85-2.9. I remember that when I went to the wild in Hualien from college, I couldn’t figure out how to distinguish between dolomite and marble on the beach. If you have a can of cold dilute hydrochloric acid next to you, you can get it. Blocky dolomite is not easy to bubble when it encounters cold dilute hydrochloric acid, but marble will immediately produce many small bubbles.
Causes and origin
Genesis: According to the Taiwan Minerals Bureau (1996) "Major minerals and rocks in Taiwan", dolomite is found in crystalline limestone and other magnesium-rich metamorphic rocks, and is partially produced in hydrothermal veins and carbonate rock pores. Occasionally, as a cement of various sedimentary rocks, it is the most common rock-forming mineral in carbonate rocks. The dolomite of Taiwan is formed by the calcareous exchange of magnesia-exchanged limestone, mainly in the crystalline limestone zone of the Dolomites in the lower part of the Da Nanao schist, which is a convex mirror body, a layered or irregular mineral sac.
Origin: Dolomite is mainly produced in Dazhuo Water, Yilan County, eastern Taiwan, Qingchang Mountain, Heping, Heren, Wanrong and Papaya Mountain in Hualien County. Other places in the world of Dolomites include the southern part of Tyrol in Switzerland and Binnanso, Quebecla in Piedmont, Italy, and Guanahuatu in North England and Mexico. Produced in the Gaplin region of Missouri, the United States forms a block in sedimentary rocks or a pink saddle-shaped crystal in rock cracks.
Economic use: Dolomite can be used as a refractory inner layer, slag forming agent, cement raw material, glass flux, kiln industry, fertilizer, building and decoration stone, paint, insecticide and medicine for the reformer used in steel making. use. Can be used in building materials, ceramics, glass and refractory materials, chemical and agricultural, environmental protection, energy conservation and other fields.
Characteristics Research: The mineral report on dolomite can be recorded in detail in the Taiwan Provincial Bureau of Minerals “Investigation Report on the Dolomite Marble Mine in Eastern Taiwan”. Liu Xinfu (1980) Master's thesis at the Institute of Mining, Metallurgy and Materials Science, National Cheng Kung University _ Research on the latent nature of dolomite in the dolomites of eastern Taiwan. Liang Jianwei (1980) studied the master's thesis of the Institute of Mining, Metallurgy and Materials Science, National Cheng Kung University, “Design of Underground Mining Method for Qingchangshan Dolomite Mine in Hualien County”. Associate Professor Deng Maohua from the Department of Geology of National Taiwan University studied the Stable Carbon and Oxygen Isotope and Mineral Chemistry of Marble in the Peaceful to Taroko Area of Eastern Taiwan in the Master's Thesis of the Institute of Geology of Taiwan University. The paper mentions the analysis of carbon and oxygen isotope of calcite marble and uses it. The symbiotic specimens of dolomite and calcite were analyzed separately for the dolomite and calcite isotopic values to infer the equilibrium conditions.
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