Kraisslite and mcgovernite: new chemical data
نویسندگان
چکیده
Chemical analytical data have been obtained for kraisslite and mcgoverdite. Kraisslite contains both trivalent and pentavalent arsenic in the weight ratio of 3 :4. Specimens from different parageneses have relatively invariant chemical compositions, which suggests some degree of ordering of Mg, Mn, andZn. The average of five analyses yields MgO 2.6, MnO 52.0, ZnO 8.6, FerO, 2.0, AsrO, 6.69, Alror 0.2, AsrO, 10.35, SiO, 12.9, }J2O 3.68 percent, totalling 98.9 percent, and yielding the empirical formula Fe]*MgoMn*Zn"(AsOr)o(AsOo)o(SiOo),r(OH)ru. Ferric iron is present in both kraisslite and mcgovernite. Additional analyses of mcgovernite give the average MgO I1.5, MnO 42.2, ZnO 9.3, FerO, 1.7, AszOr 4.6, AsrO, 12.5, SiO, 9.2, H2O 9.1 percent, totalling 100.1 percent.
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