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|Section2= |Section3= }} Barium chromate, named barium tetraoxochromate(VI) by the IUPAC, is a yellow sand like powder with the formula BaCrO4. It is a known oxidizing agent and produces a green flame when heated, a result of the barium ions. ==History== The first naturally occurring barium chromate was found in the country of Jordan. The brown crystals found perched on host rocks were named hashemite in honor of the Hashemite Kingdom of Jordan. The hashemite crystals range in color from light yellowish-brown to a darker greenish-brown and are usually less than 1mm in length.〔Hauff, Phoebe L; Foord, Eugene E; Rosenblum, Sam; and Hakki, Walid. (1983) "Hashemite, Ba(Cr,S)O4, a new mineral from Jordan." ''American Mineralogist'', 69, 1223-1225.〕 The hashemite crystals are not composed of pure barium chromate but instead contain some small sulfur content as well. The different crystals contain a range of sulfur impurities ranging from the more pure dark crystals, Ba1.00(Cr0.93, S0.07)1.00O4, to the less pure light crystals, Ba1.00(Cr0.64, S0.36)1.00O4.〔Hauff, Phoebe L; Foord, Eugene E; Rosenblum, Sam; and Hakki, Walid. (1983) "Hashemite, Ba(Cr,S)O4, a new mineral from Jordan." ''American Mineralogist'', 69, 1223-1225.〕 Hashemite was found to be an isostructural chromate analog of barite, BaWO4.〔Hauff, Phoebe L; Foord, Eugene E; Rosenblum, Sam; and Hakki, Walid. (1983) "Hashemite, Ba(Cr,S)O4, a new mineral from Jordan." ''American Mineralogist'', 69, 1223-1225.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「barium chromate」の詳細全文を読む スポンサード リンク
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