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Threadgoldite Mineral Data

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General Threadgoldite Information

Help on Chemical  Formula: Chemical Formula: Al(UO2)2(PO4)2(OH)•8(H2O)
Help on Composition: Composition: Molecular Weight = 918.11 gm
   Uranium     51.85 %  U    58.82 % UO2
   Aluminum     2.94 %  Al    5.55 % Al2O3
   Phosphorus   6.75 %  P    15.46 % P2O5
   Hydrogen     1.87 %  H    16.68 % H2O
   Oxygen      36.60 %  O
              ______        ______ 
              100.00 %       96.51 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al(UO2)2(PO4)2(OH)•8(H2O)
Help on Environment: Environment: The P analog of metavanuralite.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Kobokobo, Kivu, Zaire. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ian M. Threadgold (1929-), University of Sydney, NSW, Australia.
Help on Name Pronunciation: Name Pronunciation: Threadgoldite + Pronunciation Say THREADGOLDITE
Help on Synonym: Synonym: ICSD 31265
  PDF 33-39
 

Threadgoldite Image

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  Threadgoldite

Comments: Beige threadgoldite filling cracks in, and coating, black uraninite. Schumacher Collection.
Location: Kobokobo Pegmatite, Lusungu River District, Kivu, Congo (Zaïre). Scale: Picture size 5 mm.
© Paul M. Schumacher

Threadgoldite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0558:1:2.005
Help on Cell Dimensions: Cell Dimensions: a = 20.25, b = 9.85, c = 19.75, Z = 8; beta = 111.4° V = 3,667.79 Den(Calc)= 3.33
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.43(1), 3.474(0.8), 3.366(0.6),
 

Physical Properties of Threadgoldite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Greenish yellow.
Help on Density: Density: 3.4
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Micaceous - Platy texture with "flexible" plates.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luminescence: Luminescence: Fluorescent, Short UV=pale green, Long UV=green.
Help on Streak: Streak: yellow white
 

Optical Properties of Threadgoldite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.101 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.124 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1746,KPDmeas= 0.171,KC= 0.1553
Ncalc = 1.52 - 1.53
Help on Optical Data: Optical Data: Biaxial (-), a=1.573, b=1.583, g=1.588, bire=0.0150, 2V(Calc)=70, 2V(Meas)=70.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (z): Pleochroism (z): pale yellow.
 

Calculated Properties of Threadgoldite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.05 gm/cc
note: Specific Gravity of Threadgoldite =3.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0039118007
Boson Index = 0.9960881993
Help on Photoelectric: Photoelectric: PEThreadgoldite =1,311.25 barns/electron
U=PEThreadgoldite x relectron=4,001.28 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,966,723.37 (Gamma Ray American Petroleum Institute Units)
Concentration of Threadgoldite per GRapi unit = 252.10 (PPB)

Threadgoldite 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) 7.67 ± 1.92 grams of pure Threadgoldite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 766.80 ±191.70 grams of pure Threadgoldite .

Estimated Radioactivity from Threadgoldite - 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 / 8.25 cm 92,815,040 2.51E-03 3,966,723.37 1,304.13
100 gm / 3.83 cm 9,281,504 2.51E-04 396,672.34 130.41
10 gm / 1.78 cm 928,150 2.51E-05 39,667.23 13.04
1 gm / 8.25 mm 92,815 2.51E-06 3,966.72 1.30
0.1 gm / 3.83 mm 9,282 2.51E-07 396.67 0.13
0.01 gm / 1.78 mm 928 2.51E-08 39.67 0.01
0.001 gm / 0.83 mm 93 2.51E-09 3.97 0.00

Weight of pure Threadgoldite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.40 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
 

Threadgoldite Classification

Help on  Dana Class: Dana Class: 42.11.13.03 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.13)Vanuralite Group
 
42.11.13.01 Vanuralite Al(UO2)2(VO4)2(OH)•11(H2O) A2/a 2/m
 
42.11.13.02 Metavanuralite Al(UO2)2(VO4)2(OH)•8(H2O) P 1or P1 Tri
 
42.11.13.03 Threadgoldite Al(UO2)2(PO4)2(OH)•8(H2O) C 2/c 2/m
 
42.11.13.04 Chistyakovaite-(Y)! Al(UO2)2(AsO4)2(F,OH)•6.5H2O P 2/m, P 2 or Pm Mono
Help on  Strunz Class: Strunz Class: 08.EB.20 08 - PHOSPHATES, ARSENATES, VANADATES
  08.E - Uranyl Phosphates and Arsenates
  08.EB -UO2:RO4 = 1:1
 
08.EB.20 Threadgoldite Al(UO2)2(PO4)2(OH)•8(H2O) C 2/c 2/m
 
08.EB.20 Chistyakovaite-(Y)! Al(UO2)2(AsO4)2(F,OH)•6.5H2O P 2/m, P 2 or Pm Mono
 

Other Threadgoldite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Threadgoldite :
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
16 - WWW-MINCRYST

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

Threadgoldite

Al(UO2)2(PO4)2(OH)•8(H2O)
Dana No: 42.11.13.03 Strunz No: 08.EB.20
Locality:

 

Notes:

 

 
   
 


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