General Marecottite Information![]() Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O) |
![]() Molecular Weight = 3,310.81 gm |
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Magnesium 1.31 % Mg 2.18 % MgO |
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Uranium 59.24 % U 67.20 % UO2 |
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Manganese 0.96 % Mn 1.24 % MnO |
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Hydrogen 1.77 % H 15.79 % H2O |
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Sulfur 3.85 % S 9.60 % SO3 |
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Oxygen 32.87 % O |
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100.00 % 96.02 % = TOTAL OXIDE |
![]() Mg1.79Mn2+0.58(UO2)8.24(SO4)3.97(OH)2O5.64·28.02(H2O) |
![]() Secondary mineral formed at low pH (<5) from the oxidation of sulfides in uranium-bearing deposits. (zippeite group; structure) |
![]() Approved IMA 2003 (Dana # Added) |
![]() La Creusaz U-prospect near Les Marecottes, Western Swiss Alps, Switzerland. Link to MinDat.org Location Data. |
![]() Named for the locality. |
![]() IMA2001-056 |
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Marecottite Crystallography![]() a:b:c =0.9614:1:1.2313 |
![]() a = 10.815, b = 11.249, c = 13.851, Z = 1; alpha = 66.224°, beta = 72.412°, gamma = 69.95° V = 1,380.89 Den(Calc)= 3.98 |
![]() Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1 |
![]() By Intensity(I/Io): 9.47(1)(011), 3.44(0.8)(013), 4.74(0.8)(022),3.38(0.7)(022), 2.876(0.3)(303), 3.07(0.2)(301), 3.11(0.2)(004), 3.16(0.2)(033), 6.29(0.2)(
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| Physical Properties of Marecottite![]() {011} Perfect |
![]() Yellow orange. |
![]() 4.03 |
![]() Transparent |
![]() Brittle - Generally displayed by glasses and most non-metallic minerals. |
![]() Platy - Sheet forms (e.g. micas). |
![]() Rosette - Bundled tabular aggregates resembling rose flower petals. |
![]() Triangular Crystals - Occurs as triangular shaped crystals. |
![]() 3 - Calcite |
![]() Vitreous (Glassy) |
![]() cololess |
| Optical Properties of Marecottite![]() CI meas= -0.273 (Poor) - where the CI = (1-KPDmeas/KC) |
CI calc= -0.326 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1919,KPDmeas= 0.1842,KC= 0.1447 Ncalc = 1.56 - 1.58 ![]() Biaxial (?), a=1.735, g=1.75, bire=0.0150 |
| Calculated Properties of Marecottite![]() Bulk Density (Electron Density)=3.55 gm/cc |
note: Specific Gravity of Marecottite =4.03 gm/cc. ![]() Fermion Index = 0.0060282187 |
Boson Index = 0.9939717813 ![]() PEMarecottite =1,524.76 barns/electron |
U=PEMarecottite x relectron=5,418.64 barns/cc. ![]() |
GRapi = 4,452,864.45 (Gamma Ray American Petroleum Institute Units)
Marecottite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size
(10 mRem/hr limit, Unshielded 10 cm box)
6.83 ± 1.71 grams of pure Marecottite .
Weight of pure Marecottite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.03 gm/cc.* | Marecottite Classification![]() 31.10.04.07 (31)Hydrated Sulfates Containing Hydroxyl or Halogen |
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(31.10)miscellaneous |
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(31.10.04)Zippeite Group |
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![]() 07.EC.15 07 - SULFATES (SELENATES, TELLURATES) |
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07.E - Uranyl Sulfates |
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07.EC -With medium-sized and large cations |
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| Other Marecottite Information![]() NAME( AmMin, 88:676) PHYS. PROP.(AmMin, 88:676) OPTIC PROP.(AmMin, 88:676) |
![]() Links to other databases for Marecottite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - GeoScienceWorld 4 - Google Images 5 - Google Scholar 6 - Handbook of Mineralogy (MinSocAm) 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - Mineralienatlas (Deutsch) 10 - Online Mineral Museum 11 - QUT Mineral Atlas 12 - Ruff.Info 13 - Uranium Minerals Search for Marecottite using: Visit our Advertisers for Marecottite : A Bijoux Google Search for MarecottiteAdam's Minerals Google Search for Marecottite Cape Minerals Google Search for Marecottite Dakota Matrix Minerals Google Search for Marecottite Excalibur Mineral Corp. Google Search for Marecottite Exceptional Minerals Google Search for Marecottite John Betts Fine Minerals Search for Marecottite McDougall Minerals Google Search for Marecottite Mineral News Website Link Rock and Mineral Shows Google Search for Marecottite Weinrich Minerals, Inc. Google Search for Marecottite Ask about Marecottite here : Print or Cut-and-Paste your Marecottite Specimen Label here :
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