Magnesite Manganese

Because of this soHd solution, natural magnesite contains varying amounts of iron which can affect the ultimate use of the material. Small amounts of calcium and manganese may also be present. 

Chrome-magnesite brick, 6 495 Chrome Manganese Zinc Brown, pigment for plastics, 7 369t Chrome-mordant dyeing, 9 399 Chromenes... 

ORIGIN OF NAME The name manganese is derived from the mineral magnesite (or dolomite, a compound of magnesium carbonate), which was mined in the region of Magnesia of ancient Greece. 

Other closely located occurrences of magnesite also occur in the Anzac, Driftwood Creek, Jab, Marysville, Topaz, Cleland Lake, and Botts Lake deposits. The overall chemical composition of the deposits has been found to be similar to the Mount Brussilof deposit. However, the Mount Brussilof deposit has higher overall MgO content and lower concentrations of iron, silica, and manganese-bearing impurities. The median lime content of all the deposits is approximately the same. 

There is no visual or chemical distinction between the two different types of magnesite. Examination of the magnesite under an electron microscope reveals individual magnesite crystals in the 1- to 5-p.m range, with minor minerals present in the nodules being dolomite, quartz, clays, and iron and manganese oxides. 

If there was a large excess of magnesium chloride, or the brine was very hot, the final product could be magnesite (MgCOa). Much of the impurities in the calcite (if any) such as strontium, barium and manganese would also be reacted (Ayora et al., 2001 Vlasova and Valyashko, 1980). To a much lesser extent, calcium chloride may also be formed by reactions to produce other seawater... 

---