Tychite, Na6Mg2(SO4)(CO3) 4: Structure analysis and Raman spectroscopic data

Gregory R. Schmidt, Reynard Jacqueline, Hexiong Yang, Robert T. Downs

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Tychite, hexasodium dimagnesium sulfate tetracarbonate, is a member of the northupite [Na3Mg(CO3)2Cl] group and has a framework structure consisting of four basic units: CO32- groups (3 symmetry), SO42- tetrahedra (23 symmetry), MgO6 (3 symmetry) and NaO6 octahedra (2 symmetry). Among them, the CO32-, SO42-, and MgO 6 units are regular in shape, but the NaO6 octahedron, showing three different Na-O bond lengths, is considerably distorted. The Na atoms in tychite are slightly overbonded relative to those in northupite. The Raman spectroscopic data show three and four vibration modes for the CO 32- and SO42- groups, respectively; these are comparable to the corresponding Raman modes observed in other carbonates and sulfates.

Original languageEnglish (US)
Pages (from-to)i207-i209
JournalActa Crystallographica Section E: Structure Reports Online
Issue number10
StatePublished - Oct 2006

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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