Relationships between unit-cell parameters and composition for rock-forming minerals on Earth, Mars, and other extraterrestrial bodies

Shaunna M. Morrison, Robert T. Downs, David F. Blake, Anirudh Prabhu, Ahmed Eleish, David T. Vaniman, Douglas W. Ming, Elizabeth B. Rampe, Robert M. Hazen, Cherie N. Achilles, Allan H. Treiman, Albert S. Yen, Richard V. Morris, Thomas F. Bristow, Steve J. Chipera, Philippe C. Sarrazin, Kim V. Fendrich, John Michael Morookian, Jack Farmer, David J. DesMaraisPatricia I. Craig

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Mathematical relationships between unit-cell parameters and chemical composition were developed for selected mineral phases observed with the CheMin X-ray diffractometer onboard the Curiosity rover in Gale crater. This study presents algorithms for estimating the chemical composition of phases based solely on X-ray diffraction data. The mineral systems include plagioclase, alkali feldspar, Mg-Fe-Ca C2/c clinopyroxene, Mg-Fe-Ca P21/c clinopyroxene, Mg-Fe-Ca orthopyroxene, Mg-Fe olivine, magnetite, and other selected spinel oxides, and alunite-jarosite. These methods assume compositions of Na-Ca for plagioclase, K-Na for alkali feldspar, Mg-Fe-Ca for pyroxene, and Mg-Fe for olivine; however, some other minor elements may occur and their impact on measured unit-cell parameters is discussed. These crystal-chemical algorithms can be applied to material of any origin, whether that origin is Earth, Mars, an extraterrestrial body, or a laboratory.

Original languageEnglish (US)
Pages (from-to)848-856
Number of pages9
JournalAmerican Mineralogist
Volume103
Issue number6
DOIs
StatePublished - Jun 26 2018

Keywords

  • alunite
  • CheMin
  • crystal chemistry
  • Gale crater
  • jarosite
  • magnetite
  • Mars
  • Mars Science Laboratory
  • Martian Rocks and Minerals
  • Meteorites
  • olivine
  • Orbiters
  • Perspectives from Rovers
  • plagioclase
  • pyroxene
  • spinel
  • unit-cell parameters
  • X-ray diffraction

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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    Morrison, S. M., Downs, R. T., Blake, D. F., Prabhu, A., Eleish, A., Vaniman, D. T., Ming, D. W., Rampe, E. B., Hazen, R. M., Achilles, C. N., Treiman, A. H., Yen, A. S., Morris, R. V., Bristow, T. F., Chipera, S. J., Sarrazin, P. C., Fendrich, K. V., Morookian, J. M., Farmer, J., ... Craig, P. I. (2018). Relationships between unit-cell parameters and composition for rock-forming minerals on Earth, Mars, and other extraterrestrial bodies. American Mineralogist, 103(6), 848-856. https://doi.org/10.2138/am-2018-6123