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- Title
Relationships between unit-cell parameters and composition for rock-forming minerals on Earth, Mars, and other extraterrestrial bodies.
- Authors
Morrison, Shaunna M.; Downs, Robert T.; Blake, David F.; Prabhu, Anirudh; Eleish, Ahmed; Vaniman, David T.; Ming, Douglas W.; Rampe, Elizabeth B.; Hazen, Robert M.; Achilles, Cherie N.; Treiman, Allan H.; Yen, Albert S.; Morris, Richard V.; Bristow, Thomas F.; Chipera, Steve J.; Sarrazin, Philippe C.; Fendrich, Kim V.; Morookian, John Michael; Farmer, Jack D.; Marais, David J. Des
- 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 <italic>C</italic>2/<italic>c</italic> clinopyroxene, Mg-Fe-Ca <italic>P</italic>21/<italic>c</italic> 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.
- Subjects
MINERAL properties; EARTH (Planet); MARS (Planet)
- Publication
American Mineralogist, 2018, Vol 103, Issue 6, p848
- ISSN
0003-004X
- Publication type
Article
- DOI
10.2138/am-2018-6123