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Marecottite Mineral Data

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General Marecottite Information

Help on Chemical  Formula: Chemical Formula: Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O)
Help on Composition: Composition: Molecular Weight = 3,310.81 gm
   Magnesium   1.31 %  Mg    2.18 % MgO
   Uranium    59.24 %  U    67.20 % UO2
   Manganese   0.96 %  Mn    1.24 % MnO
   Hydrogen    1.77 %  H    15.79 % H2O
   Sulfur      3.85 %  S     9.60 % SO3
   Oxygen     32.87 %  O
             ______        ______ 
             100.00 %       96.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.79Mn2+0.58(UO2)8.24(SO4)3.97(OH)2O5.64�28.02(H2O)
Help on Environment: Environment: Secondary mineral formed at low pH (<5) from the oxidation of sulfides in uranium-bearing deposits. (zippeite group; structure)
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: La Creusaz U-prospect near Les Marecottes, Western Swiss Alps, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2001-056
 

Marecottite Image

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  Marecottite

Comments: SEM image of a typical marecottite aggregate. Note the perfect cleavage along (011) and the trace of the twin composition plane (arrow). (AmMin, v 88, p 678).
Location: La Creusaz, Swiss Alps. Scale: See Image.
© American Mineralogist

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  Magnesiozippeite   Marecottite

Comments: Powdery and crystalline aggregates of red-brown marecottite and yellow magnesiozippeite on matrix.
Location: Svornost Mine, Jachymov, Bohemia, Czech Republic. Scale: Specimen Size 6.5x9 cm.
© Diederik Visser

Marecottite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9614:1:1.2313
Help on Cell Dimensions: Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: 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)(
 

Physical Properties of Marecottite

Help on Cleavage: Cleavage: {011} Perfect
Help on Color: Color: Yellow orange.
Help on Density: Density: 4.03
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Habit: Habit: Triangular Crystals - Occurs as triangular shaped crystals.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: cololess
 

Optical Properties of Marecottite

Help on Gladstone-Dale: Gladstone-Dale: 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
Help on Optical Data: Optical Data: Biaxial (?), a=1.735, g=1.75, bire=0.0150
 

Calculated Properties of Marecottite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Marecottite =4.03 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0060282187
Boson Index = 0.9939717813
Help on Photoelectric: Photoelectric: PEMarecottite =1,524.76 barns/electron
U=PEMarecottite x relectron=5,418.64 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 4,452,864.45 (Gamma Ray American Petroleum Institute Units)
Concentration of Marecottite per GRapi unit = 224.57 (PPB)

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 .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 683.08 ±170.77 grams of pure Marecottite .

Estimated Radioactivity from Marecottite - very strong
Specimen
Size
Weight/Volume
(Sphere)
*
Calculated
Activity
Bequerols
(Bq)
Calculated
Activity
Curies (Ci)
Estimated
Activity
GR(api)
Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.80 cm 106,041,448 2.87E-03 4,452,864.45 1,463.96
100 gm / 3.62 cm 10,604,145 2.87E-04 445,286.45 146.40
10 gm / 1.68 cm 1,060,414 2.87E-05 44,528.64 14.64
1 gm / 7.80 mm 106,041 2.87E-06 4,452.86 1.46
0.1 gm / 3.62 mm 10,604 2.87E-07 445.29 0.15
0.01 gm / 1.68 mm 1,060 2.87E-08 44.53 0.01
0.001 gm / 0.78 mm 106 2.87E-09 4.45 0.00

Weight of pure Marecottite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.03 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
 

Marecottite Classification

Help on  Dana Class: Dana Class: 31.10.04.07 (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10)miscellaneous
  (31.10.04)Zippeite Group
 
31.10.04.01 Zippeite K4(UO2)6(SO4)3(OH)10•4(H2O) C 2/m 2/m
 
31.10.04.02 Natrozippeite Na4(UO2)6(SO4)3(OH)10•4(H2O) Unk Ortho
 
31.10.04.03 Magnesiozippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m
 
31.10.04.04 Nickelzippeite Ni2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho
 
31.10.04.05 Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho
 
31.10.04.06 Cobaltzippeite Co2(UO2)6(SO4)3(OH)10•16(H2O) Unk Ortho
 
31.10.04.07 Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O) P1 1
 
31.10.04.08 Pseudojohannite! Cu6.5[(UO2)4O4(SO4)2]2(OH)5•25H2O P1 or P1 Tri
 
31.10.04.09 IMA2009-008 Y2[(UO2)8O6(SO4)4(OH)2]•26H2O P1 1
Help on  Strunz Class: Strunz Class: 07.EC.15 07 - SULFATES (SELENATES, TELLURATES)
  07.E - Uranyl Sulfates
  07.EC -With medium-sized and large cations
 
07.EC.15 Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O) P1 1
 

Other Marecottite Information

Help on References: References: NAME( AmMin, 88:676) PHYS. PROP.(AmMin, 88:676) OPTIC PROP.(AmMin, 88:676)
Help on See Also: See Also: 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

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Print or Cut-and-Paste your Marecottite Specimen Label here :

Marecottite

Mg3(H2O)18[(UO2)4O3(SO4)2]2•10(H2O)
Dana No: 31.10.04.07 Strunz No: 07.EC.15
Locality:

 

Notes:

 

 
   
 


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