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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian

IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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Volume 92, Issue 10


Letter: Meridianiite: A new mineral species observed on Earth and predicted to exist on Mars

R.C. Peterson
  • Corresponding author
  • Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario, K7L 3N6, Canada
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/ W. Nelson / B. Madu
  • Mining and Minerals Division, Ministry of Energy Mines and Petroleum Resources, Kamloops, British Columbia, V2C 4N7, Canada
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/ H.F. Shurvell
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2007.2668


Meridianiite, MgSO4·11H2O, was recently discovered on the surface of a frozen pond in central British Columbia, Canada. Meridianiite is stable below 2 °C. Above 2 °C, it melts incongruently to a slurry of epsomite (MgSO4·7H2O) and water. Magnesium sulfate minerals are thought to exist in the soils at Gusev crater and elsewhere on the Martian surface. These minerals can form by precipitation from a saturated solution or through evaporation of a brine solution at or below the surface. Meridianiite, instead of epsomite, is the expected magnesium sulfate phase in equilibrium with saturated brines below 2 °C on or below the Martian surface. It is expected to be the magnesium sulfate mineral in equilibrium with ice in the Martian polar ice caps. Meridianiite, if exposed to low humidity conditions in equatorial regions of Mars, would ultimately dehydrate to a fine dust of kieserite (MgSO4·H2O) that could be dispersed by wind across the Martian surface. The name, meridianiite, was chosen to reflect the locality on Mars where the MER rover Opportunity observed crystal molds in sedimentary rock that are thought to be caused by minerals that have since dehydrated or dissolved.

Keywords: Mars; epsomite; new mineral; sulfate; hydrated magnesium sulfate; meridianiite; kieserite

About the article

Received: 2007-04-12

Accepted: 2007-06-05

Published Online: 2015-04-01

Published in Print: 2007-10-01

Citation Information: American Mineralogist, Volume 92, Issue 10, Pages 1756–1759, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2007.2668.

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