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.

Name Pronunciation:

Dewindtite + Pronunciation

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, Rhône-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

Diaphaneity:

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, Short UV=green, Long 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
Ncalc = 1.66 - 1.67

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:

Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Dewindtite =5.12 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

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

Radioactivity:

GRapi = 3,568,742.73 (Gamma Ray American Petroleum Institute Units)
Concentration of Dewindtite per GRapi unit = 280.21 (PPB)

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	88,035,943	2.38E-03	3,568,742.73	1,173.29
100 gm / 3.34 cm	8,803,594	2.38E-04	356,874.27	117.33
10 gm / 1.55 cm	880,359	2.38E-05	35,687.43	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:

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

(42.09)where (A)3 (XO4)2 Zq · x(H2O)

(42.09.08)Dana Group

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

Strunz Class:

08.EC.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.E - Uranyl Phosphates and Arsenates

08.EC -UO2:RO4 = 3:2

08.EC.10 Arsenuranylite Ca(UO2)4(AsO4)2(OH)4•6(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Dewindtite Pb3[H(UO2)3O2(PO4)2]2•12(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Kivuite? (Th,Ca,Pb)H2(UO2)4(PO4)2(OH)8•7(H2O) Unk Ortho

08.EC.10 Renardite Pb(UO2)4(PO4)2(OH)4•7(H2O) Bmmb 2/m 2/m 2/m

08.EC.10 Phosphuranylite KCa(H3O)3(UO2)7(PO4)4O4•8(H2O) C mcm 2/m 2/m 2/m

08.EC.10 Yingjiangite (K2,Ca)(UO2)7(PO4)4(OH)6•6(H2O) Bmmb 2/m 2/m 2/m

Other Dewindtite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4:Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

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

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

Dewindtite

Pb3[H(UO2)3O2(PO4)2]2•12(H2O)
Dana No: 42.09.08.01 Strunz No: 08.EC.10
Locality:

Notes: