Margaritasite Mineral Data

Margaritasite Mineral Data +

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General Margaritasite Information

Chemical Formula:

(Cs,K,H3O)2(UO2)2V2O8·(H2O)

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

Empirical Formula:

Cs_1.2K_0.6(H₃O)_0.2(UO₂)₂V⁵⁺₂O₈·(H₂O)

IMA Status:

Approved IMA 1982

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 15839

PDF 25-1218

Margaritasite Image

Images:

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

Axial Ratios:

a:b:c =1.2479:1:0.8605

Cell Dimensions:

a = 10.514, b = 8.425, c = 7.25, Z = 2; beta = 106.01° V = 617.30 Den(Calc)= 5.24

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 6.965(1), 3.344(0.7), 3.6(0.7),

Physical Properties of Margaritasite

Color:

Yellow.

Density:

5.4

Hardness:

2 - Gypsum

Streak:

light yellow

Optical Properties of Margaritasite

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

Electron Density:

r_electron=4.47 gm/cc
note: r_{Margaritasite}=5.24 gm/cc.

Fermion Index

Fermion Index = 0.00388
Boson Index = 0.99612

Photoelectric:

PE_{Margaritasite}=1,375.06 barns/electron
U=PE_{Margaritasite} x r_electron=6,144.51 barns/cc.

Radioactivity:

GRapi = 3,550,269.93 (Gamma Ray American Petroleum Institute Units)

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	3,550,269.93	1,167.21
100 gm / 3.32 cm	8,742,705	2.36E-04	355,026.99	116.72
10 gm / 1.54 cm	874,271	2.36E-05	35,502.70	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

Dana Class:

40.2a.28.2 (40)Hydrated Phosphates, etc

(40.2a)where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++

(40.2a.28)Dana Group

40.2a.28.1 Carnotite K2(UO2)2V2O8·3(H2O) P 2₁/a 2/m

40.2a.28.2 Margaritasite (Cs,K,H3O)2(UO2)2V2O8·(H2O) P 2₁/a 2/m

Strunz Class:

VII/E.11-60 VII - Phosphates, Arsenates and Vanadates

VII/E - Uranylphosphates and uranylvanadates with: [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6-, uranyl-groupvanadates with [UO2]2+ - [V2O8]6-

VII/E.11 - Tyuyamunite series

VII/E.11-10 Vanuralite Al(UO2)2(VO4)2(OH)·11(H2O) A2/a 2/m

VII/E.11-20 Metavanuralite Al(UO2)2(VO4)2(OH)·8(H2O) P 1or P1 Tri

VII/E.11-30 Sengierite Cu2(UO2)2V2O8·6(H2O) P 2₁/a 2/m

VII/E.11-40 Strelkinite Na2(UO2)2V2O8·6(H2O) Pnmm,Pnm2 Ortho

VII/E.11-50 Carnotite K2(UO2)2V2O8·3(H2O) P 2₁/a 2/m

VII/E.11-60 Margaritasite (Cs,K,H3O)2(UO2)2V2O8·(H2O) P 2₁/a 2/m

VII/E.11-70 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8·4(H2O)(?) C 2/c ? 2/m

VII/E.11-80 Tyuyamunite Ca(UO2)2V2O8·5-8(H2O) Pnan 2/m 2/m 2/m

VII/E.11-90 Metatyuyamunite Ca(UO2)2V2O8·3(H2O) Pnam 2/m 2/m 2/m

VII/E.11-100 Francevillite (Ba,Pb)(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m

VII/E.11-110 Curienite Pb(UO2)2V2O8·5(H2O) Pcan 2/m 2/m 2/m

Other Margaritasite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Margaritasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - Uranium Minerals 13 -École des Mines de Paris

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Margaritasite

(Cs,K,H3O)2(UO2)2V2O8·(H2O)
Dana No: 40.2a.28.2 Strunz No: VII/E.11-60
Locality:

Notes: