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Dewindtite Mineral Data

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General Dewindtite Information

Help on Chemical  Formula: Chemical Formula: Pb3[H(UO2)3O2(PO4)2]2•12(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Pb3H2(UO2)6O4(PO4)4•12(H2O)
Help on Environment: Environment: Rare secondary mineral formed by alteration of uraninite or earlier U-bearing minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1922
Help on Locality: Locality: Kasolo and Swambo, (Shinkolobwe), Katanga (Shaba) Province, Congo (Zaire). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jean Dewindt, Belgian geologist.
Help on Name Pronunciation: Name Pronunciation: Dewindtite + Pronunciation Say DEWINDTITE
Help on Synonym: Synonym: ICSD 69399
  PDF 39-1350

Dewindtite Image

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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

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  Kivuite   Dewindtite

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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9285:1:0.788
Help on Cell Dimensions: Cell Dimensions: a = 16.031, b = 17.264, c = 13.605, Z = 4; V = 3,765.31 Den(Calc)= 5.12
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Bmmb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.89(1), 8.01(1), 3.14(0.9),

Physical Properties of Dewindtite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Greenish yellow, Yellow, Light yellow.
Help on Density: Density: 5.03
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Pulverulent - Forms a loose, poorly-coherent powdery mass.
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=green, Long UV=green.
Help on Streak: Streak: light yellow

Optical Properties of Dewindtite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): golden yellow.
Help on Pleochroism (z): Pleochroism (z): golden yellow.

Calculated Properties of Dewindtite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.36 gm/cc
note: Specific Gravity of Dewindtite =5.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEDewindtite =1,697.01 barns/electron
U=PEDewindtite x relectron=7,396.56 barns/cc.
Help on Radioactivity: 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
Curies (Ci)
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

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.09)where (A)3 (XO4)2 Zq � x(H2O)
  (42.09.08)Dana Group Dewindtite Pb3[H(UO2)3O2(PO4)2]2•12(H2O) Bmmb 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(AntBidBlaNic4:Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - Uranium Minerals

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Dana No: Strunz No: 08.EC.10





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