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Maricite
Maricite or ''marićite'' is a sodium iron phosphate mineral (NaFe2+PO4), that has two metal cations connected to a phosphate tetrahedron. It is structurally similar to the much more common mineral olivine. Maricite is brittle, usually colorless to gray, and has been found in nodules within shale beds often containing other minerals.
Maricite is most commonly known to be found in the Big Fish River area of the Yukon Territory, Canada, but it has also been found in Eastern Germany, as well as inside of various meteorites around the world. Maricite is named after Luka Maric of Croatia, (1899–1979), the longtime head of the mineralogy and petrography departments at the University of Zagreb.
Maricite is a sodium iron phosphate from the extremely diverse phosphate mineral group. In 1977 maricite was discovered in the Big Fish River area, Yukon Territory, Canada (Fleischer, Chao, and Mandarino, 1979). This is an important geologic location that has provided the discovery of several new phosphate minerals. Maricite is recognized for its possible use in sodium ion battery research as well as its role as a reaction product inside of fossil-fired electrical power generating station boilers which experience corrosion (Bridson, ''et al.'', 1997; Ong, ''et al.'', 2011).
==Composition==
Maricite is a member of the phosphate mineral group. Phosphate minerals have one or more metal cations bonded to the phosphate anion PO4. (Hawthorne, F.C., 1998). In maricite the metals bonded to PO4 are sodium and iron (Sturman, ''et al.'', 1977). The empirical formula for maricite is NaFePO4 and it has a molar mass of 173.81 g/mol (Yahia, ''et al.'', 2008; Tremaine, Xiao, 1999). The general formula for maricite is ABPO4, (Yahia, ''et al.'', 2008). The chemical composition was originally found by Dr. Corlett from the Department of Geological Sciences at Queen’s University, Kingston, Ontario. The formula was determined using electron microprobe analysis, and the resulting formula was found to be, Na 0.91(Fe 0.89 Mn 0.07 Mg 0.03)P 1.02 O 4.00 (Sturman, ''et al.'', 1977) when normalized to four oxygen atoms. The weight percentages were determined using six different points on a thin section and averaging the percentages of each oxide in all of the samples. The results in weight percent average of oxides are as follows: Na2O 16.5%, MgO 0.8%, CaO 0.0%, MnO 3.1%, FeO 37.4%, P2O5 42.5%, with a total of 100.3%. When looking at these results, one may determine that the majority of the oxide weight composition is made of FeO with P2O5 making up almost the same weight percentage. There is a significant percentage of the Na2O oxide and an insignificant percentage of the CaO oxide (~0). It is clear from looking at the oxide content of the mineral that the main components are going to be sodium, iron, phosphorus, and oxygen. The oxide factor may be used to determine the weight percentages of the individual elements as follows, 1 sodium atom totaling ~13% of composition, 1 iron atom totaling ~32% of composition, 1 phosphorus atom totaling ~18% of composition, and 4 oxygen atoms totaling ~37% of composition (Sturman, ''et al.'', 1977).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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