[Chemical composition] wolframite tungsten, manganese ore and actually complete class quality tungsten ore with iron like the intermediate member family. Often containing Mg, Ca, Nb, Ta, Sn, Zn, and the like. [Crystal structure] monoclinic system; [Form] Single crystals often have a {100} plate shape or a short column shape extending along the c-axis (Fig. Y-28), and the crystal faces in the [001] crystal band often have stripes parallel to the c-axis. The twin crystal is often in contact with the twin crystal (100) or (023). The aggregate is blade-shaped or coarse-grained. Figure Y-29 shows the parallel crystal of the black tungsten ore. Figure Y-27 Crystal structure of black tungsten ore (quoted from Pan Zhaoyu et al., 1993) Figure Y-28 The black tungsten ore crystal has a {100} plate shape extending along the c-axis. Figure Y-29 Hematite crystal (parallel crystal) (According to Wang Wenkui, etc., produced in Duo Luoshan, Huaiji, Guangdong, 1992) [Physical properties] reddish brown (tungsten ore) to black (Ferberite); brown streaks (tungsten ore) to dark brown (Ferberite); metallic luster to half luster (gloss black resin (tungsten ore) Tungsten ore, tungsten iron ore). Cleavage parallel {010} complete. Hardness 4 to 4.5. The relative density is 7.12 (tungsten manganese ore) ~ 7.51 (tungsten iron ore). Crisp. Tungsten iron ore is weakly magnetic. [genesis and occurrence] is mainly produced in high temperature hydrothermal quartz veinside Yunying lithification granite . It is often associated with cassiterite , molybdenite , arsenopyrite, fluorite , tourmaline , beryl. Black tungsten ore can also form sand mines. China is the world's largest tungsten-producing country. The types of deposits are abundant and the scale is rare for the world's tungsten deposits. More than 20 large and super large deposits have been discovered in the Nanling area alone. The most representative tungsten deposits are Guangdong (Sawbank Quartz vein type deposit), Hunan (Shizhuyuan layer controlled skarn type deposit), Fujian (Lokeng granite fine vein immersed tungsten deposit), Guangxi (Da Ming Mountain-like layered tungsten deposits) and so on. [Identification characteristics] Hematite is characterized by its plate-like morphology, brownish black, {010} complete cleavage and relative density. [Main use] The most important ore mineral of tungsten. Special alloy steels for tungsten are used in the manufacture of high-speed cutting tools, guns, barrels, rocket engines, rocket nozzles, tank armor, etc. Tungsten is also used in the manufacture of cathode materials for filaments and X-ray generators. The synthetic material tungsten carbide has a high hardness, second only to diamond , and can be used as a drill bit, a turning tool, and the like.
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a 0 = 0.479 nm, b 0 = 0.574 nm, c 0 = 0.499 nm, β = 90 ° 26'. Z=2. In the crystal structure, the [Mn(Fe)O 6 ] coordination octahedron is co-edgely joined into a chain line parallel to the c-axis direction; [WO 6 ] coordination octagonal is also parallel to the c-axis and is located in [Mn (Fe)O 6 ] The chain formed by the coordination octahedron is connected to the upper and lower chains by its four corners. Therefore, the crystal structure can be regarded as a chain structure, and can also be regarded as a parallel layered structure of {100} (Fig. Y-27).
(Mn, Fe) WO 4
October 27, 2024