Dewindtite Mineral Data

Dewindtite Mineral Data +

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General Dewindtite Information

Chemical Formula:

Pb3[H(UO2)3O2(PO4)2]2·12(H2O)

Composition:

Molecular Weight = 2,903.85 gm

Uranium 49.18 % U 55.79 % UO₂

Phosphorus 4.27 % P 9.78 % P₂O₅

Hydrogen 0.90 % H 8.07 % H₂O

Lead 21.41 % Pb 23.06 % PbO

Oxygen 24.24 % O

______ ______

100.00 % 96.69 % = TOTAL OXIDE

Empirical Formula:

Pb₃H₂(UO₂)₆O₄(PO₄)₄·12(H₂O)

Environment:

Rare secondary mineral formed by alteration of uraninite or earlier U-bearing minerals.

IMA Status:

Valid Species (Pre-IMA) 1922

Locality:

Kasolo and Swambo, (Shinkolobwe), Katanga (Shaba) Province, Congo (Zaire). Link to MinDat.org Location Data.

Name Origin:

Named for Jean Dewindt, Belgian geologist.

Synonym:

ICSD 69399

PDF 39-1350

Dewindtite Image

Images:

Dewindtite

Comments: Yellow dewindtite exposed on fracture surface. Schumacher Collection.
Location: Les Bois-Noirs Mine, Loire, Rh?ne-Alpes, France. Scale: Picture size 5 mm.
© Paul M. Schumacher

Images:

Dewindtite Kivuite

Comments: Pale yellow coatings of kivuite with yellowier dewindtite on pegmatite.
Location: Ruggles Mine, Grafton, Grafton County, New Hampshire, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Dewindtite Crystallography

Axial Ratios:

a:b:c =0.9285:1:0.788

Cell Dimensions:

a = 16.031, b = 17.264, c = 13.605, Z = 4; V = 3,765.31 Den(Calc)= 5.12

Crystal System:

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

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

By Intensity(I/I_o): 5.89(1), 8.01(1), 3.14(0.9),

Crystal Structure:

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Piret P , Piret-Meunier J , Deliens M , European Journal of Mineralogy , 2 (1990) p.399-405, Composition chimique et structure cristalline de la dewindtite, Pb3[H(UO2)3O2(PO4)2]2.12H2O

Physical Properties of Dewindtite

Cleavage:

[100] Perfect

Color:

Greenish yellow, Yellow, Light yellow.

Density:

5.03

Diaphaniety:

Translucent

Fracture:

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

Habit:

Pulverulent - Forms a loose, poorly-coherent powdery mass.

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent and radioactive, Short UV=green.

Streak:

light yellow

Optical Properties of Dewindtite

Gladstone-Dale:

CI meas= -0.155 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.135 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1496,KPDmeas= 0.1523,KC= 0.1318

Optical Data:

Biaxial (-), a=1.76-1.762, b=1.767-1.768, g=1.768-1.77, bire=0.0080, 2V(Calc)=40-58, 2V(Meas)=large.

Pleochroism (x):

colorless.

Pleochroism (y):

golden yellow.

Pleochroism (z):

golden yellow.

Calculated Properties of Dewindtite

Electron Density:

r_electron=4.36 gm/cc
note: r_Dewindtite=5.12 gm/cc.

Fermion Index

Fermion Index = 0.05096
Boson Index = 0.94904

Photoelectric:

PE_Dewindtite=1,697.01 barns/electron
U=PE_Dewindtite x r_electron=7,396.56 barns/cc.

Radioactivity:

GRapi = 3,568,741.76 (Gamma Ray American Petroleum Institute Units)

Dewindtite 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) 8.52 ± 2.13 grams of pure Dewindtite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 852.31 ±213.08 grams of pure Dewindtite .

**Estimated Radioactivity from Dewindtite** - 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 / 7.20 cm	88,035,941	2.38E-03	3,568,741.76	1,173.28
100 gm / 3.34 cm	8,803,594	2.38E-04	356,874.18	117.33
10 gm / 1.55 cm	880,359	2.38E-05	35,687.42	11.73
1 gm / 7.20 mm	88,036	2.38E-06	3,568.74	1.17
0.1 gm / 3.34 mm	8,804	2.38E-07	356.87	0.12
0.01 gm / 1.55 mm	880	2.38E-08	35.69	0.01
0.001 gm / 0.72 mm	88	2.38E-09	3.57	0.00

Weight of pure Dewindtite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.12 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

Dewindtite Classification

Dana Class:

42.9.8.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.8)Dana Group

42.9.8.1 Dewindtite Pb3[H(UO2)3O2(PO4)2]2·12(H2O) Bmmb 2/m 2/m 2/m

Strunz Class:

VII/E.07-80 VII - Phosphates, Arsenates and Vanadates

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

VII/E.07 - Phosphuranylite series

VII/E.07-10 Phuralumite Al2(UO2)3(PO4)2(OH)6·10(H2O) P 2₁/a 2/m

VII/E.07-20 Mundite Al(UO2)3(PO4)2(OH)3·5(H2O) P 2₁cn,Pmcn Ortho

VII/E.07-25 Yingjiangite (K2,Ca)(UO2)7(PO4)4(OH)6·6(H2O) Bmmb 2/m 2/m 2/m

VII/E.07-30 Phosphuranylite KCa(H3O)3(UO2)7(PO4)4O4·8(H2O) C mcm 2/m 2/m 2/m

VII/E.07-40 Phurcalite Ca2(UO2)3O2(PO4)2·7(H2O) P bca 2/m 2/m 2/m

VII/E.07-50 Arsenuranylite Ca(UO2)4(AsO4)2(OH)4·6(H2O) Bmmb 2/m 2/m 2/m

VII/E.07-60 Bergenite Ca2Ba4[(UO3)2O2(PO4)2]3(H2O)16 P 2₁/c 2/m

VII/E.07-70 Francoisite-(Nd) (Nd,Y,Sm,Ce)(UO2)3(PO4)2O(OH)·6(H2O) P 2₁/c 2/m

VII/E.07-80 Dewindtite Pb3[H(UO2)3O2(PO4)2]2·12(H2O) Bmmb 2/m 2/m 2/m

VII/E.07-90 Dumontite Pb2(UO2)3O2(PO4)2·5(H2O) P 2₁/m 2/m

VII/E.07-100 Hugelite Pb2(UO2)3(AsO4)2(OH)4·3(H2O) P 2₁/m 2/m

VII/E.07-110 Kamitugaite PbAl(UO2)5(PO4)2(OH)9·9.5(H2O) P1,P 1 Tri

VII/E.07-120 Kivuite? (Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8·7(H2O) Unk Ortho

VII/E.07-130 Althupite ThAl(UO2)7(PO4)4(OH)5·15(H2O) P1 1

VII/E.07-140 Vanmeersscheite U(UO2)3(PO4)2(OH)6·4(H2O) P mn2₁ mm2

VII/E.07-150 Metavanmeersscheite U(UO2)3(PO4)2(OH)6·2(H2O) F dd2 mm2

Other Dewindtite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4) OPTIC PROP.(AntBidBlaNic4)

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Dewindtite

Pb3[H(UO2)3O2(PO4)2]2·12(H2O)
Dana No: 42.9.8.1 Strunz No: VII/E.07-80
Locality:

Notes: