Magnesium-zippeite Mineral Data

Magnesium-zippeite Mineral Data

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General Magnesium-zippeite Information

Chemical Formula:

Mg(H2O)3.5(UO2)2(SO4)O2

Composition:

Molecular Weight = 755.48 gm

Magnesium 3.22 % Mg 5.33 % MgO

Uranium 63.01 % U 71.49 % UO₂

Hydrogen 0.93 % H 8.35 % H₂O

Sulfur 4.24 % S 10.60 % SO₃

Oxygen 28.59 % O

______ ______

100.00 % 95.76 % = TOTAL OXIDE

Empirical Formula:

Mg(H₂O)_3.5(UO₂)₂(SO₄)O₂

Environment:

Secondary mineral formed at low pH (<5) from the oxidation of sulfides in uranium-bearing deposits.

IMA Status:

Approved IMA 1976

Locality:

Lucky StrikeNo. 2 mine, Emery County, Utah, USA. Link to MinDat.org Location Data.

Name Origin:

Named for its composition and for Franz Xaver Maxmillian Zippe (1791-1863), Austrian mineralogist.

Synonym:

IMA2000-G

Mg-zippeite

Zippeite-Mg

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Magnesium-zippeite Crystallography

Axial Ratios:

a:b:c =0.6102:1:1.249

Cell Dimensions:

a = 8.654, b = 14.182, c = 17.714, Z = 6; beta = 103.92° V = 2,110.21 Den(Calc)= 3.57

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.58(1), 3.48(0.8), 7.2(0.8),

Physical Properties of Magnesium-zippeite

Color:

Yellow, Yellowish orange.

Density:

3.3

Diaphaniety:

Transparent to Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Earthy (Dull)

Optical Properties of Magnesium-zippeite

Gladstone-Dale:

CI meas= -0.742 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.61 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2082,KPDmeas= 0.2253,KC= 0.1293

Optical Data:

Biaxial (?), a=1.7, b=1.74, g=1.79, bire=0.0900

Calculated Properties of Magnesium-zippeite

Electron Density:

r_electron=3.09 gm/cc
note: r_{Magnesium-zippeite}=3.57 gm/cc.

Fermion Index

Fermion Index = 0.00821
Boson Index = 0.99179

Photoelectric:

PE_{Magnesium-zippeite}=1,651.86 barns/electron
U=PE_{Magnesium-zippeite} x r_electron=5,105.03 barns/cc.

Radioactivity:

GRapi = 4,649,747.49 (Gamma Ray American Petroleum Institute Units)

Magnesium-zippeite 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) 6.54 ± 1.64 grams of pure Magnesium-zippeite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 654.16 ±163.54 grams of pure Magnesium-zippeite .

**Estimated Radioactivity from Magnesium-zippeite** - 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 / 8.12 cm	112,795,525	3.05E-03	4,649,747.49	1,528.68
100 gm / 3.77 cm	11,279,553	3.05E-04	464,974.75	152.87
10 gm / 1.75 cm	1,127,955	3.05E-05	46,497.47	15.29
1 gm / 8.12 mm	112,796	3.05E-06	4,649.75	1.53
0.1 gm / 3.77 mm	11,280	3.05E-07	464.97	0.15
0.01 gm / 1.75 mm	1,128	3.05E-08	46.50	0.02
0.001 gm / 0.81 mm	113	3.05E-09	4.65	0.00

Weight of pure Magnesium-zippeite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.57 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

Magnesium-zippeite Classification

Dana Class:

31.10.4.3 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.10)miscellaneous

(31.10.4)Zippeite Group

31.10.4.1 Zippeite K4(UO2)6(SO4)3(OH)10·4(H2O) C 2/m 2/m

31.10.4.2 Sodium-zippeite Na4(UO2)6(SO4)3(OH)10·4(H2O) Unk Ortho

31.10.4.3 Magnesium-zippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m

31.10.4.4 Nickel-zippeite Ni2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

31.10.4.5 Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

31.10.4.6 Cobalt-zippeite Co2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

31.10.4.7 Marecottite! Mg3(H2O)18[(UO2)4O3(SO4)2]2·10(H2O) P1 1

Strunz Class:

VI/D.20-50 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Uranylsulfates [UO2]4+ - [SO4]2-

VI/D.20 - Uranopilite - Rabejacite series

VI/D.20-05 Jachymovite! (UO2)8(SO4)(OH)14·13(H2O) P 2₁,P 2₁/m Mono

VI/D.20-10 Uranopilite [(UO2)6(SO4)O2(OH)6(H2O)6]·8(H2O) P1 1

VI/D.20-20 Meta-uranopilite (UO2)6(SO4)(OH)10·5(H2O) Unk Ortho

VI/D.20-30 Sodium-zippeite Na4(UO2)6(SO4)3(OH)10·4(H2O) Unk Ortho

VI/D.20-40 Zippeite K4(UO2)6(SO4)3(OH)10·4(H2O) C 2/m 2/m

VI/D.20-50 Magnesium-zippeite Mg(H2O)3.5(UO2)2(SO4)O2 C 2/m 2/m

VI/D.20-60 Cobalt-zippeite Co2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-70 Nickel-zippeite Ni2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-80 Zinc-zippeite Zn2(UO2)6(SO4)3(OH)10·16(H2O) Unk Ortho

VI/D.20-85 Deliensite! Fe(UO2)2(SO4)2(OH)2·3(H2O) Pnnm or Pnn2 Ortho

VI/D.20-90 Rabejacite Ca(UO2)4(SO4)2(OH)6·6(H2O) Unk Ortho

Other Magnesium-zippeite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed., AmMin v 88, p 676) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Magnesium-zippeite

Mg(H2O)3.5(UO2)2(SO4)O2
Dana No: 31.10.4.3 Strunz No: VI/D.20-50
Locality:

Notes: