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Marécottite

A valid IMA mineral species
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08933490015022872035242.jpg
Marécottite

Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA
06461260014949143001001.jpg
Marécottite

Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA
05834090014977647513284.jpg
Marécottite

Plavno mine, Hanušov, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republic
09176250015022850307706.jpg
Marécottite

Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA
02324080014949010322403.jpg
Marécottite

Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA
04503560015053814205498.jpg
Marécottite

Plavno mine, Hanušov, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republic
08933490015022872035242.jpg
Marécottite

Markey Mine, Red Canyon Mining District, San Juan County, Utah, USA
06461260014949143001001.jpg
Marécottite

Blue Lizard Mine, Red Canyon Mining District, San Juan County, Utah, USA
Hide all sections | Show all sections

About MarécottiteHide

06344430014947156594799.jpg
Entrance to the exploration gallery

La Creusaz U prospect, La Creusaz, Les Marécottes, Salvan, Saint-Maurice, Valais, Switzerland
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.


Unique IdentifiersHide

Mindat ID:
27152
Long-form identifier:
mindat:1:1:27152:5
GUID
(UUID V4):
965a2323-f649-4b43-b082-ac1345af10d3

IMA Classification of MarécottiteHide

IMA status:
Approved
IMA Formula:
Mg3O6(UO2)8(SO4)4(OH)2 · 28H2O
Approval year:
2001
First published:
2003

Classification of MarécottiteHide

Strunz-mindat (2024):
7.EC.15

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
McoIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MarécottiteHide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Yellow-orange
Streak:
White ("colorless")
Hardness:
3 on Mohs scale
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

Chemistry of MarécottiteHide

Mindat Formula:
Mg3(UO2)8(SO4)4O6(OH)2 · 28H2O
Elements listed:
H, Mg, O, S, U - search for minerals with similar chemistry

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)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.46 Å(100)
4.73 Å(80)
3.44 Å(80)
3.39 Å(70)
2.88 Å(30)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47b : [Sulfates and sulfites]
47f : [Uranyl (U⁶⁺) minerals]
Stage 10b: Anthropogenic minerals<10 Ka
55 : Anthropogenic mine minerals
Geological Setting:
Weathered uranium deposits

Type Occurrence of MarécottiteHide

Type Locality:
ⓘ La Creusaz U prospect, La Creusaz, Les Marécottes, Salvan, Saint-Maurice, Valais, Switzerland
General Appearance of Type Material:
Diamond shaped platelets to 500 µm, commonly twinned, and grouped into rosettes.
Place of Conservation of Type Material:
Musée Géologique Cantonal at Lausanne, Switzerland. Holotype MGL58285 and cotype MGL58290.
Geological Setting of Type Material:
Recently formed alteration products of uraninite. Stockpiled uranium ore and associated sulfides, in an underground mine, subjected to acid mine drainage water, atmospheric oxygen, and bacterial activity.
Associated Minerals at Type Locality:
UraniniteRabejacitePseudojohanniteJohanniteGypsum

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:
18 photos of Marécottite associated with NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2O
11 photos of Marécottite associated with GypsumCaSO4 · 2H2O
6 photos of Marécottite associated with NickelzippeiteNi2(UO2)6(SO4)3(OH)10 · 16H2O
5 photos of Marécottite associated with UraniniteUO2
2 photos of Marécottite associated with Zippeite Group
2 photos of Marécottite associated with Sandstone
2 photos of Marécottite associated with DevillineCaCu4(SO4)2(OH)6 · 3H2O
2 photos of Marécottite associated with MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2O
1 photo of Marécottite associated with BayleyiteMg2(UO2)(CO3)3 · 18H2O
1 photo of Marécottite associated with ThérèsemagnaniteNaCo4(SO4)(OH)6Cl · 6H2O

Related Minerals - Strunz-mindat GroupingHide

7.EC.AdolfpateraiteK(UO2)(SO4)(OH)(H2O)Mon. 2/m : P21/b
7.EC.Beshtauite(NH4)2(UO2)(SO4)2 · 2H2OMon. 2/m : P21/b
7.EC.SeaborgiteLiK2Na6(UO2)(SO4)5(SO3OH)(H2O)Tric. 1 : P1
7.EC.Nitscheite(NH4)2[(UO2)2(SO4)3(H2O)2] · 3H2OMon. 2/m
7.EC.OldsiteK2Fe2+[(UO2)(SO4)2]2(H2O)8Orth. mm2 : Pmn21
7.EC.Libbyite(NH4)2(Na2◻)[(UO2)2(SO4)3(H2O)]2 · 7H2OTet. 4 2 2 : P41 21 2
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.05PlavnoiteK0.8Mn0.6[(UO2)2O2(SO4)] · 3.5H2OMon. 2/m : B2/m
7.EC.05Redcanyonite(NH4)2Mn[(UO2)4O4(SO4)2](H2O)4Mon. 2/m : B2/m
7.EC.05Ammoniozippeite(NH4)2[(UO2)2(SO4)O2] · H2OOrth. mmm (2/m 2/m 2/m)
7.EC.10RabejaciteCa(UO2)4(SO4)2(OH)6 · 6H2OTric. 1 : P1
7.EC.10SvornostiteK2Mg[(UO2)(SO4)2]2 · 8H2OOrth. mm2 : Pmn21
7.EC.15Sejkoraite-(Y)Y2(UO2)8(SO4)4O6(OH)2 · 26H2OTric. 1 : P1
7.EC.20PseudojohanniteCu3(OH)2[(UO2)4(SO4)2] · 12H2OTric. 1 : P1
7.EC.40BluelizarditeNa7(UO2)(SO4)4Cl(H2O)2Mon. 2/m : B2/b
7.EC.45MeisseriteNa5(UO2)(SO4)3(SO3OH)(H2O)Tric. 1 : P1
7.EC.45FermiiteNa4(UO2)(SO4)3 · 3H2OOrth. mm2 : Pmn21
7.EC.45OppenheimeriteNa2(UO2)(SO4)2 · 3H2OTric. 1 : P1
7.EC.50PlášiliteNa(UO2)(SO4)(OH) · 2H2OMon. 2/m : P21/b
7.EC.50FeynmaniteNa(UO2)(SO4)(OH) · 3.5H2OMon.
7.EC.55GeschieberiteK2(UO2)(SO4)2 · 2H2OOrth. mm2 : Pna21
7.EC.60OttohahniteNa6(UO2)2(SO4)5(H2O)7 · 1.5H2OTric. 1 : P1
7.EC.65PéligotiteNa6(UO2)(SO4)4 · 4H2OTric. 1 : P1
7.EC.70KlaprothiteNa6(UO2)(SO4)4 · 4H2OMon. 2/m : P21/b
7.EC.75Lussierite Na10[(UO2)(SO4)4](SO4)2 · 3(H2O)Mon. m : Bb
7.EC.80NavrotskyiteK2Na10(UO2)3(SO4)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbcm
7.EC.85Pseudomeisserite-(NH4)(NH4)2Na4[(UO2)2(SO4)5] · 4H2OMon. 2/m : P21/b
7.EC.90WetherilliteNa2Mg(UO2)2(SO4)4 · 18H2OMon. 2/m : P21/b

Fluorescence of MarécottiteHide

In UV light:
Not fluorescent

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.

Internet Links for MarécottiteHide

References 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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Czech Republic
 
  • Karlovy Vary Region
    • Karlovy Vary District
Am Min 88:4 pp 676-685
Tvrdý et al. (2010)
Plášil et al. (2014)
        • Svornost Mine
Tvrdý et al. (2010)
      • Ostrov
        • Hanušov
Thorne (n.d.) +1 other reference
  • Vysočina Region
    • Žďár nad Sázavou District
      • Rožná
        • Rožná deposit
Petr Pauliš
Germany
 
  • Saxony
    • Erzgebirgskreis
      • Annaberg-Buchholz
        • Kleinrückerswalde
Möhn et al. (07/2020)
Italy
 
  • Trentino-Alto Adige (Trentino-South Tyrol)
    • Trento Province (Trentino)
      • Bocenago
        • Monte Toff
Campostrini I. (2013)
Switzerland (TL)
 
  • Valais
    • Saint-Maurice
      • Salvan
        • Les Marécottes
          • La Creusaz
Brugger et al. (2003)
USA
 
  • Utah
    • Emery County
      • San Rafael Swell Mining District
Brugger et al. (2003)
    • San Juan County
      • Red Canyon Mining District
Collected by and in the collection of ...
Collected by Joe Marty +1 other reference
      • White Canyon Mining District
Collected by Pat Haynes and analysis ...
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