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|Name:||Named 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.|
A phase that is stable with a saturated brine or with ice and which melts above 2°C into a slurry of Epsomite and water. It has now been found occurring naturally on Earth (on the surface of a frozen pond, and in ice cores) and is suspected of existing on Mars.
Classification of Meridianiite
|IMA status:||Approved 2007|
|Nickel-Strunz 10th (pending) edition ID:||7.CB.90|
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
C : Sulfates (selenates, etc.) without additional anions, with H2O
B : With only medium-sized cations
|Dana 8th edition ID:||220.127.116.11|
29 : HYDRATED ACID AND NORMAL SULFATES
6 : AXO4·xH2O
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Type Occurrence of Meridianiite
|Type Locality:||Basque claims, Venables Valley, Ashcroft, Kamloops Mining Division, British Columbia, Canada|
Crystallography of Meridianiite
|Class (H-M):||1 - Pinacoidal|
|Cell Parameters:||a = 6.7459Å, b = 6.8173Å, c = 17.299Å|
α = 88.137°, β = 89.481°, γ = 62.719°
|Ratio:||a:b:c = 0.99 : 1 : 2.538|
|Unit Cell Volume:||V 706.68 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Chemical Properties of Meridianiite
|Simplified for copy/paste:||MgSO4·11H2O|
|Essential elements:||H, Mg, O, S|
|All elements listed in formula:||H, Mg, O, S|
Relationship of Meridianiite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
Other Names for Meridianiite
|Other Information:||Stable only below 2° C. Above that temperature it melts incongruently to a slurry of |
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Meridianiite
Peterson, R.C. & Wang, R. (2006): Crystal Molds on Mars: Melting of a
possible new mineral species to create Martian chaotic terrain. Geology, 34, 957-960.
Peterson, R.C., Nelson, W., Madu, B., Shurvell, H.F. (2007): Meridianiite (MgSO4·11H2O): a new mineral species observed on Earth and predicted to exist on Mars. Seventh International Conference on Mars, 3124. (http://www.lpi.usra.edu/meetings/7thmars2007/pdf/3124.pdf)
Peterson, R.C., W. Nelson, B. Madu, and H.F. Shurvell (2007): Meridianiite: A new mineral species observed on Earth and predicted to exist on Mars. American Mineralogist, 92, 1756-1759.
F. Elif Genceli, Martin Lutz, Anthony L. Spek, Geert-Jan Witkamp (2007):
Crystallization and Characterization of a New Magnesium Sulfate Hydrate MgSO4 · 11H2O. Crystal Growth & Design 2007, 7, 2460-2466.
Fortes, A.D., Wood, I.G., Knight, K.S. (2008): The crystal structure and thermal expansion tensor of MgSO4–11D2O (meridianiite) determined by neutron powder diffraction. Physics and Chemistry of Minerals, 35, 207-221.
Genceli, F.E., Horikawa, S., Iizuka, Y., Toshimitsu, S., Hondoh, T., Kawamura, T., Witkamp, G.-J. (2009): Meridianiite detected in ice. Journal of Glaciology, 189, 117-122.
Fortes, A. D., Browning, F., Wood, I. G. (2012): Cation substitution in synthetic meridianiite (MgSO4•11H2O) I: X-ray powder diffraction analysis of quenched polycrystalline aggregates. Physics and Chemistry of Minerals 39, 419-441.
Fortes, A. D., Browning, F., Wood, I. G. (2012): Cation substitution in synthetic meridianiite (MgSO4•11H2O) II: variation in unit-cell parameters determined from X-ray powder diffraction data. Physics and Chemistry of Minerals 39, 443-454.
Internet Links for Meridianiite
Localities for Meridianiite
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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