Crystal and molecular structure and spectroscopic behavior of isotypic synthetic analogs of the oxalate minerals stepanovite and zhemchuzhnikovite
- Piro, Oscar Enrique
- Echeverría, Gustavo Alberto
- Gonzalez Baro, Ana Cecilia
- Baran, Enrique José
DOIAbstract
The crystal structure of synthetic stepanovite,Na[Mg(H2O)6][Fe(C2O4)3]·3H2O, and zhemchuzhnikovite,Na[Mg(H2O)6][Al0.55Fe0.45(C2O4)3]·3H2O, has beendetermined by single-crystal X-ray diffraction methods.The compounds are isotypic to each other and to the previouslyreported Na[Mg(H2O)6][M(C2O4)3]·3H2O (M:Cr, Al).They crystallize in the trigonal P3c1 space groupwith Z = 6 molecules per unit cell and (hexagonal axes)a = 17.0483(4), c = 12.4218(4) Å for the iron compound,and a = 16.8852(5), c = 12.5368(5) Å for the Al/Fe solidsolution. Comparison of our crystallographic results withprevious X-ray diffraction and chemical data of typestepanovite and zhemchuzhnikovite minerals providescompelling evidence that these natural materials possessthe sam...
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