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Germanate
In chemistry germanate is a compound containing an oxyanion of germanium. In the naming of inorganic compounds it is a suffix that indicates a polyatomic anion with a central germanium atom,〔(Nomenclature of Inorganic Chemistry IUPAC Recommendations 2005 ) - Full text (PDF)〕 for example potassium hexafluorogermanate, K2GeF6.〔Egon Wiberg, Arnold Frederick Holleman (2001) ''Inorganic Chemistry'', Elsevier ISBN 0123526515〕 ==Germanate oxy compounds== Germanium is similar to silicon forming many compounds with tetrahedral 〔 units although it can also exhibit 5 and 6〔 coordination. Analogues of all the major types of silicates and aluminosilicates have been prepared. For example the compounds Mg2GeO4 (olivine and spinel forms), CaGeO3(perovskite structure), Be2GeO4 (phenakite structure) show the resemblance to the silicates.〔〔Encyclopedia of alkaline earth compounds R.C Ropp, Elsevier 2013 ISBN 978-0-444-59550-8〕 BaGe4O9 has a complex structure containing 4 and 6 coordinate germanium 〔 Germanates are important for geoscience as they possess similar structures to silicates and can be used as analogues for studying the behaviour of silicate minerals found in the earths mantle, for example MnGeO3 has a pyroxene type structure similar to that of MgSiO3 which is a significant mineral in the mantle.
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