Mineralogy Database

Margaritasite Mineral Data

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General Margaritasite Information

Help on Chemical  Formula: Chemical Formula: (Cs,K,H3O)2(UO2)2V2O8•(H2O)
Help on Composition: Composition: Molecular Weight = 974.70 gm
   Cesium     16.36 %  Cs   17.35 % Cs2O
   Potassium   2.41 %  K     2.90 % K2O
   Uranium    48.84 %  U    55.41 % UO2
   Vanadium   10.45 %  V    18.66 % V2O5
   Hydrogen    0.27 %  H     2.40 % H2O
   Oxygen     21.67 %  O
             ______        ______ 
             100.00 %       96.72 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cs1.2K0.6(H3O)0.2(UO2)2V5+2O8•(H2O)
Help on Environment: Environment: Principle ore mineral found in pore fillings and phenocryst casts in felsic volcanic tuffs, which have been altered by high-temperature hydrothermal fluids.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Margaritas uranium deposit, Pe�na Blanca district, about 70 km north of Chihuahua City, Chihuahua, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Margaritasite Say MARGARITASITE
Help on Synonym: Synonym: ICSD 15839
  PDF 25-1218
 

Margaritasite Image

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  Margaritasite

Comments: Bright yellow earthy margaritasite crust on rhyolite.
Location: Margaritas Open Pit Mine, Sierra Pena Blanca, Chihuahua,. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Margaritasite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.2479:1:0.8605
Help on Cell Dimensions: Cell Dimensions: a = 10.514, b = 8.425, c = 7.25, Z = 2; beta = 106.01° V = 617.30 Den(Calc)= 5.24
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.965(1), 3.344(0.7), 3.6(0.7),
 

Physical Properties of Margaritasite

Help on Color: Color: Yellow.
Help on Density: Density: 5.4
Help on Hardness: Hardness: 2 - Gypsum
Help on Streak: Streak: light yellow
 

Optical Properties of Margaritasite

Help on Optical Data: Optical Data: NCalc= 1.8 - from Gladstone-Dale relationship (KC = 0.1533) where Ncalc=Dcalc*KC+1
NCalc= 1.83 - from Gladstone-Dale relationship (KC = 0.1533) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Margaritasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.47 gm/cc
note: Specific Gravity of Margaritasite =5.24 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0038852036
Boson Index = 0.9961147964
Help on Photoelectric: Photoelectric: PEMargaritasite =1,375.06 barns/electron
U=PEMargaritasite x relectron=6,144.51 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,550,271.38 (Gamma Ray American Petroleum Institute Units)
Concentration of Margaritasite per GRapi unit = 281.67 (PPB)

Margaritasite 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) 8.57 ± 2.14 grams of pure Margaritasite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 856.74 ±214.19 grams of pure Margaritasite .

Estimated Radioactivity from Margaritasite - 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 / 7.14 cm 87,427,050 2.36E-03 3,550,271.38 1,167.21
100 gm / 3.32 cm 8,742,705 2.36E-04 355,027.14 116.72
10 gm / 1.54 cm 874,271 2.36E-05 35,502.71 11.67
1 gm / 7.14 mm 87,427 2.36E-06 3,550.27 1.17
0.1 gm / 3.32 mm 8,743 2.36E-07 355.03 0.12
0.01 gm / 1.54 mm 874 2.36E-08 35.50 0.01
0.001 gm / 0.71 mm 87 2.36E-09 3.55 0.00

Weight of pure Margaritasite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.24 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
 

Margaritasite Classification

Help on  Dana Class: Dana Class: 40.02a.28.02 (40)Hydrated Phosphates, etc
  (40.02a)where A++ (B++)2 (XO4) � x(H2O), containing (UO2)++
  (40.02a.28)Dana Group
 
40.02a.28.01 Carnotite K2(UO2)2V2O8•3(H2O) P 21/a 2/m
 
40.02a.28.02 Margaritasite (Cs,K,H3O)2(UO2)2V2O8•(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 04.HB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HB -Uranyl Sorovanadates
 
04.HB.05 Carnotite K2(UO2)2V2O8•3(H2O) P 21/a 2/m
 
04.HB.05 Margaritasite (Cs,K,H3O)2(UO2)2V2O8•(H2O) P 21/a 2/m
 

Other Margaritasite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Margaritasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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

Margaritasite

(Cs,K,H3O)2(UO2)2V2O8•(H2O)
Dana No: 40.02a.28.02 Strunz No: 04.HB.05
Locality:

 

Notes:

 

 
   
 


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