General Threadgoldite Information
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Chemical Formula: |
Al(UO2)2(PO4)2(OH)·8(H2O) |
Composition: |
Molecular Weight = 918.11 gm |
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Uranium 51.85 % U 58.82 % UO2 |
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Aluminum 2.94 % Al 5.55 % Al2O3 |
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Phosphorus 6.75 % P 15.46 % P2O5 |
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Hydrogen 1.87 % H 16.68 % H2O |
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Oxygen 36.60 % O |
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______ ______ |
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100.00 % 96.51 % = TOTAL OXIDE |
Empirical Formula: |
Al(UO2)2(PO4)2(OH)·8(H2O) |
Environment: |
The P analog of metavanuralite. |
IMA Status: |
Approved IMA 1979 |
Locality: |
Kobokobo, Kivu, Zaire. Link to MinDat.org Location Data. |
Name Origin: |
Named for Ian M. Threadgold (1929-), University of Sydney, NSW, Australia. |
Synonym: |
ICSD 31265 |
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PDF 33-39 |
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Threadgoldite Image |
Images:
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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 (Za?re).
Scale: Picture size 5 mm.
© Paul M. Schumacher |
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Threadgoldite Crystallography
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Axial Ratios: |
a:b:c =2.0558:1:2.005 |
Cell Dimensions: |
a = 20.25, b = 9.85, c = 19.75, Z = 8; beta = 111.4° V = 3,667.79 Den(Calc)= 3.33 |
Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c |
X Ray Diffraction: |
By Intensity(I/Io): 9.43(1), 3.474(0.8), 3.366(0.6), |
Crystal Structure:
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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
A - Atoms On/Off
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Khosrawan-Sazedj F , Tschermaks Mineralogische und Petrographische Mitteilungen , 30 (1982) p.111-115, On the space group of threadgoldite
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Physical Properties of Threadgoldite
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Cleavage: |
[???] Perfect |
Color: |
Greenish yellow. |
Density: |
3.4 |
Diaphaniety: |
Translucent |
Habit: |
Micaceous - Platy texture with "flexible" plates. |
Habit: |
Tabular - Form dimensions are thin in one direction. |
Hardness: |
2-3 - Gypsum-Calcite |
Luminescence: |
Fluorescent, Short UV=pale green, Long UV=green. |
Streak: |
yellow white |
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Optical Properties of Threadgoldite
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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 |
Optical Data: |
Biaxial (-), a=1.573, b=1.583, g=1.588, bire=0.0150, 2V(Calc)=70, 2V(Meas)=70. |
Pleochroism (x): |
colorless. |
Pleochroism (z): |
pale yellow. |
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Calculated Properties of Threadgoldite
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Electron Density: |
relectron=3.05 gm/cc note: rThreadgoldite =3.40 gm/cc. |
Fermion Index |
Fermion Index = 0.00391 Boson Index = 0.99609 |
Photoelectric: |
PEThreadgoldite =1,311.26 barns/electron U=PEThreadgoldite x relectron=4,001.28 barns/cc. |
Radioactivity: |
GRapi = 3,966,721.39 (Gamma Ray American Petroleum Institute Units)
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 |
92,815,026 |
2.51E-03 |
3,966,721.39 |
1,304.13 |
| 100 gm / 3.83 cm |
9,281,503 |
2.51E-04 |
396,672.14 |
130.41 |
| 10 gm / 1.78 cm |
928,150 |
2.51E-05 |
39,667.21 |
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
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Threadgoldite Classification
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Dana Class: |
42.11.13.3 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.11)where (AB)4 (XO4)3 Zq · x(H2O) |
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(42.11.13)Dana Group |
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42.11.13.1 Vanuralite Al(UO2)2(VO4)2(OH)·11(H2O) A2/a 2/m |
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42.11.13.2 Metavanuralite Al(UO2)2(VO4)2(OH)·8(H2O) P 1or P1 Tri |
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42.11.13.3 Threadgoldite Al(UO2)2(PO4)2(OH)·8(H2O) C 2/c 2/m |
Strunz Class: |
VII/E.05-40 VII - Phosphates, Arsenates and Vanadates |
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VII/E - Uranylphosphates and uranylvanadates with [UO2]2+ - [PO4 | AsO4]3- and [UO2]2+ - [V2O8]6- |
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VII/E.05 - Ranunculite - Moreauite series |
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VII/E.05-10 Ranunculite HAl(UO2)(PO4)(OH)3·4(H2O) Unk (pseudo ORTH) Mono |
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VII/E.05-20 Triangulite Al3(UO2)4(PO4)4(OH)5·5(H2O) P1,P 1 Tri |
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VII/E.05-30 Upalite Al(UO2)3(PO4)2O(OH)·7(H2O) P 21/a 2/m |
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VII/E.05-40 Threadgoldite Al(UO2)2(PO4)2(OH)·8(H2O) C 2/c 2/m |
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VII/E.05-50 Furongite Al2(UO2)(PO4)3(OH)2·8(H2O) P1 1 |
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VII/E.05-60 Moreauite Al3(UO2)(PO4)3(OH)2·13(H2O) P 21/c 2/m |
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Other Threadgoldite Information
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References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
See Also: |
Links to other databases for Threadgoldite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (UofA)
7 -MinDAT
8 -MinMax(Deutsch)
9 -MinMax(English)
10 -Mineralienatlas (Deutsch)
11 -QUT Mineral Atlas
12 - Uranium Minerals
13 - WWW-MINCRYST
14 -École des Mines de Paris
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Print or Cut-and-Paste your Threadgoldite Specimen Label here :
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Threadgoldite
Al(UO2)2(PO4)2(OH)·8(H2O)
Dana No: 42.11.13.3 Strunz No: VII/E.05-40
Locality:
Notes:
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