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Marécottite

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About MarécottiteHide

Formula:
Mg3(UO2)8(SO4)4O6(OH)2 · 28H2O
Colour:
yellow-orange
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
4.03
Crystal System:
Triclinic
Name:
For the village of Les Marécottes, whose church is 1100 meters from the type locality.
Related to the minerals of the Zippeite Group.

See especially also magnesiozippeite.


Classification of MarécottiteHide

Approved
Approval Year:
2001
7.EC.15

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
E : Uranyl sulfates
C : With medium-sized and large cations

Physical Properties of MarécottiteHide

Vitreous
Transparency:
Transparent
Colour:
yellow-orange
Streak:
colorless
Hardness:
Tenacity:
Very brittle
Cleavage:
Perfect
(011)
Density:
4.03 g/cm3 (Measured)    3.83 g/cm3 (Calculated)

Optical Data of MarécottiteHide

Type:
Biaxial
RI values:
n = 1.735 - 1.75
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
Pale yellow to orange yellow

Chemical Properties of MarécottiteHide

Formula:
Mg3(UO2)8(SO4)4O6(OH)2 · 28H2O
IMA Formula:
Mg3O6(UO2)8(SO4)4(OH)2 · 28H2O

Crystallography of MarécottiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.815 Å, b = 11.249 Å, c = 13.852 Å
α = 66.224°, β = 72.412°, γ = 69.995°
Ratio:
a:b:c = 0.961 : 1 : 1.231
Unit Cell V:
1422.1 ų
Twinning:
Common, perpendicular to (011)

Type Occurrence of MarécottiteHide

General Appearance of Type Material:
diamond shaped platelets to 500 µm
Place of Conservation of Type Material:
Musée Géologique Cantonal at Lausanne, Switzerland
Geological Setting of Type Material:
Alteration products of uraninite

Synonyms of MarécottiteHide

Other Language Names for MarécottiteHide

Relationship of Marécottite to other SpeciesHide

Structurally related to group(s):
Zippeite GroupA group of metal uranyl sulphates.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Natrozippeite9 photos of Marécottite associated with Natrozippeite on mindat.org.
Nickelzippeite6 photos of Marécottite associated with Nickelzippeite on mindat.org.
Zippeite1 photo of Marécottite associated with Zippeite on mindat.org.
Gypsum1 photo of Marécottite associated with Gypsum on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

7.EC.AdolfpateraiteK(UO2)(SO4)(OH)(H2O)Mon. 2/m : P21/b
7.EC.05CobaltzippeiteCo(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05NickelzippeiteNi2(UO2)6(SO4)3(OH)10 · 16H2O Mon.
7.EC.05NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2OMon. 2/m : P21/m
7.EC.05ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2OMon. 2/m : B2/m
7.EC.05ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2OMon. 2 : B2
7.EC.10RabejaciteCa(UO2)4(SO4)2(OH)6 · 6H2OOrth.
7.EC.15Sejkoraite-(Y)Y2(UO2)8(SO4)4O6(OH)2 · 26H2OTric. 1 : P1
7.EC.20PseudojohanniteCu3(OH)2[(UO2)4(SO4)2]· 12H2OTric.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MarécottiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Brugger, J., Burns, P., Meisser, N. (2003) Contribution to the mineralogy of acid drainage of uranium minerals: marécottite and the zippeite group. American Mineralogist: 88: 676-685.
Burns, P.C. (2005) U 6+ minerals and inorganic compounds: insights into an expanded structural hierarchy of crystal structures. Canadian Mineralogist: 43: 1839-1894.
Plášil, J. (2015) New crystal-chemical data for marécottite. Mineralogical Magazine: 79, 649–660.

Internet Links for MarécottiteHide

Localities for MarécottiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Karlovy Vary Region
    • Krušné Hory Mts (Erzgebirge)
      • Jáchymov District (St Joachimsthal)
Am Min 88:4 pp 676-685
Tvrdý, J. & Plášil, J. (2010): Jáchymov - Reiche Erzlagerstätte und Radonbad im böhmischen Westerzgebirge. Aufschluss 61, 277-292.
Jakub Plášil, Jiří Sejkora, Radek Škoda, Pavel Škácha (2014): The recent weathering of uraninite from the Červená vein, Jáchymov (Czech Republic): a fingerprint of the primary mineralization geochemistry onto the alteration association. Journal of Geosciences, 59, 223-253.
          • Svornost Mine (Einigkeit Mine)
Tvrdý, J. & Plášil, J. (2010): Jáchymov - Reiche Erzlagerstätte und Radonbad im böhmischen Westerzgebirge. Aufschluss 61, 277-292.
In the collection of Brent Thorne.
  • Vysočina Region
    • Žďár nad Sázavou District
      • Rožná
        • Rožná deposit
Petr Pauliš, Stanislav Kopecký, Pavel Černý: Uranové minerály České republiky a jejich lokality 2007
Italy
 
  • Trentino-Alto Adige (Trentino-Südtirol)
    • Trento Province
      • Giudicarie Valleys
        • Rendena Valley
          • Bocenago & Spiazzo
Campostrini I.(2013): Minerali secondari dei giacimenti uraniferi nelle Arenarie di Val Gardena del Trentino occidentale (Alpi Meridionali, Italia). Studi Trent. Sci. Nat., 93, pagg. 89-114.
Switzerland (TL)
 
  • Wallis (Valais)
    • Le Trient Valley
      • Les Marécottes
Am Min 88:4 pp 676-685
USA
 
  • Utah
    • Emery Co.
      • San Rafael District (San Rafael Swell)
Am Min 88:4 pp 676-685
    • San Juan Co.
      • White Canyon District
        • Red Canyon
Collected by and in the collection of Brent Thorne. EDS confirmed.
Collected by Joe Marty, in the collection of Alex Earl
        • White Canyon
Collected by Pat Haynes and analysis presumably done by Pat Haynes in order to describe this species from this locality.
Mineral and/or Locality  
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