Orthowalpurgite Mineral Data

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General Orthowalpurgite Information

Chemical Formula:

(UO2)Bi4O4(AsO4)2•2(H2O)

Composition:

Molecular Weight = 1,483.82 gm

Uranium 16.04 % U 18.20 % UO₂

Bismuth 56.34 % Bi 62.81 % Bi₂O₃

Arsenic 10.10 % As 15.49 % As₂O₅

Hydrogen 0.27 % H 2.43 % H₂O

Oxygen 17.25 % O

______ ______

100.00 % 98.92 % = TOTAL OXIDE

Empirical Formula:

(UO₂)Bi₄O₄(AsO₄)₂•2(H₂O)

Environment:

May have formed by weathering of emplectite, wittichenite or other Bi-bearing ore minerals. Dimorphous with walpugite.

IMA Status:

Approved IMA 1995

Locality:

The Schmiedestollen, Wittichen, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

It is an orthorhombic polymorph of walpurgite.

Name Pronunciation:

Orthowalpurgite + Pronunciation

Synonym:

ICSD 80915

IMA1994-024

PDF 48-1889

Orthowalpurgite Image

Images:

Orthowalpurgite

Comments: Plastic container with fragments of the holotype specimen for orthowalpurgite.
Location: Schmiedestollen, Black Forest, near Wittichen, Baden-Württemberg, Germany. Scale: Not Given.
© German Type Specimen Catalogue

Orthowalpurgite Crystallography

Axial Ratios:

a:b:c =0.4121:1:1.5524

Cell Dimensions:

a = 5.492, b = 13.324, c = 20.685, Z = 4; V = 1,513.63 Den(Calc)= 6.51

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbcm

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

By Intensity(I/I_o): 3.208(1), 10.354(0.94), 3.088(0.76),

Forms:

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Forms: ( 0 1 0) ( 1 0 4) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Krause W , Effenberger H , Brandstatter F , European Journal of Mineralogy , 7 (1995) p.1313-1324, Orthowalpurgite, (UO2)Bi4O4(AsO4)2.2H2O,, a new mineral from the Black Forest, Germany, Locality: Black Forest, Germany

Physical Properties of Orthowalpurgite

Cleavage:

{001} Indistinct

Color:

Pale yellow.

Density:

6.5

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Adamantine

Streak:

pale yellow

Optical Properties of Orthowalpurgite

Gladstone-Dale:

CI meas= -0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1516,KPDmeas= 0.1518,KC= 0.1476
Ncalc = 1.96

Optical Data:

Biaxial (-), a=1.91, b=2, g=2.05, bire=0.1400, 2V(Calc)=70, 2V(Meas)=70.

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Orthowalpurgite

Electron Density:

Bulk Density (Electron Density)=5.46 gm/cc
note: Specific Gravity of Orthowalpurgite =6.51 gm/cc.

Fermion Index:

Fermion Index = 0.0012387819
Boson Index = 0.9987612181

Photoelectric:

PE_{Orthowalpurgite}=1,523.30 barns/electron
U=PE_{Orthowalpurgite} x r_electron=8,313.94 barns/cc.

Radioactivity:

GRapi = 1,146,367.29 (Gamma Ray American Petroleum Institute Units)
Concentration of Orthowalpurgite per GRapi unit = 872.32 (PPB)

Orthowalpurgite 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) 26.53 ± 6.63 grams of pure Orthowalpurgite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 2653.3 ±663.33 grams of pure Orthowalpurgite .

**Estimated Radioactivity from Orthowalpurgite** - very strong
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 6.64 cm	28,714,596	7.76E-04	1,146,367.29	376.89
100 gm / 3.08 cm	2,871,460	7.76E-05	114,636.73	37.69
10 gm / 1.43 cm	287,146	7.76E-06	11,463.67	3.77
1 gm / 6.64 mm	28,715	7.76E-07	1,146.37	0.38
0.1 gm / 3.08 mm	2,871	7.76E-08	114.64	0.04
0.01 gm / 1.43 mm	287	7.76E-09	11.46	0.00
0.001 gm / 0.66 mm	29	7.76E-10	1.15	0.00

Weight of pure Orthowalpurgite in grams (gm) and Calculated Diameter of a Sphere with a Density of 6.51 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

Orthowalpurgite Classification

Dana Class:

40.05.09.02 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.09)Walpurgite Group

40.05.09.01 Walpurgite Bi4(UO2)(AsO4)2O4•2(H2O) P1 1

40.05.09.02 Orthowalpurgite (UO2)Bi4O4(AsO4)2•2(H2O) Pbcm 2/m 2/m 2/m

40.05.09.03 Phosphowalpurgite! (UO2)Bi4(PO4)O4•2(H2O) P1 1

Strunz Class:

08.EA.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EA -UO2:RO4 = 1:2

08.EA.05 Orthowalpurgite (UO2)Bi4O4(AsO4)2•2(H2O) Pbcm 2/m 2/m 2/m

08.EA.05 Walpurgite Bi4(UO2)(AsO4)2O4•2(H2O) P1 1

08.EA.05 Phosphowalpurgite! (UO2)Bi4(PO4)O4•2(H2O) P1 1

Other Orthowalpurgite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1014,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Orthowalpurgite :
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

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

Orthowalpurgite

(UO2)Bi4O4(AsO4)2•2(H2O)
Dana No: 40.05.09.02 Strunz No: 08.EA.05
Locality:

Notes: