Boltwoodite Mineral Data (original) (raw)
General Boltwoodite Information
Chemical Formula:
HK(UO2)(SiO4)•1.5(H2O)
Composition:
Molecular Weight = 429.24 gm
Potassium 9.11 % K 10.97 % K2O
Uranium 55.45 % U 62.91 % UO2
Silicon 6.54 % Si 14.00 % SiO2
Hydrogen 0.94 % H 8.39 % H2O
Oxygen 27.96 % O
______ ______
100.00 % 96.27 % = TOTAL OXIDE
Empirical Formula:
HK(UO2)(SiO4)•1.5(H2O)
Environment:
In the outer silicate zone of alteration surrounding hydrated uranyl oxides incrusting primary uraninite; also filling fractures at some distance from primary uraninite.
IMA Status:
Valid Species (Pre-IMA) 1956
Locality:
In the USA, from the Delta mine, Emery Co., Utah; the New Method mine, near Amboy, San Bernardino Co., California. Link to MinDat.org Location Data.
Name Origin:
For Bertram Borden Boltwood (1870-1927), radiochemist of Yale University, New Haven, Connecticut, USA, who devised the U-Pb method of measuring geologic time.
Name Pronunciation:
Boltwoodite + Pronunciation 
Synonym:
ICSD 86631
Nenadkevite
PDF 35-490
Boltwoodite Image
Images:
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Boltwoodite Comments: Sprays of boltwoodite covering matrix. Location: Rossing, Namibia.Scale: Size Not Given. © John Veevaert |
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Images:
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Boltwoodite Comments: Bright yellow, prismatic crystals of boltwoodite. Location: Rössing mine, Swakopmund District, Namibia.Scale: Picture size 2.5 mm. © Paul M. Schumacher |
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Images:
Boltwoodite Crystallography
Axial Ratios:
a:b:c =1.9201:1:1.7296
Cell Dimensions:
a = 13.71, b = 7.14, c = 12.35, Z = 6; beta = 102.2° V = 1,181.63 Den(Calc)= 3.62
Crystal System:
Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 21
X Ray Diffraction:
By Intensity(I/Io): 6.81(1), 3.4(0.9), 2.95(0.8),
Crystal Structure:
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| | Stohl F V , Smith D K , American Mineralogist , 66 (1981) p.610-625, The crystal chemistry of the uranyl silicate minerals View Additional jPOWD Structure files for Boltwoodite [1] | | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
Physical Properties of Boltwoodite
Cleavage:
{010} Perfect, {001} Distinct
Color:
Yellow, Light yellow.
Density:
3.6
Hardness:
3.5-4 - Copper Penny-Fluorite
Luminescence:
Fluorescent, Short UV=dull green, Long UV=dull green.
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Boltwoodite
Gladstone-Dale:
CI meas= -0.346 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.338 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1901,KPDmeas= 0.1912,KC= 0.1421
Ncalc = 1.51
Optical Data:
Biaxial (-), a=1.669, b=1.6955, g=1.7005, bire=0.0315
Pleochroism (x):
colorless.
Pleochroism (y):
colorless.
Pleochroism (z):
colorless.
Calculated Properties of Boltwoodite
Electron Density:
Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Boltwoodite =3.62 gm/cc.
Fermion Index:
Fermion Index = 0.0071947992
Boson Index = 0.9928052008
Photoelectric:
PEBoltwoodite =1,429.97 barns/electron
U=PEBoltwoodite x relectron=4,558.55 barns/cc.
Radioactivity:
GRapi = 4,162,622.33 (Gamma Ray American Petroleum Institute Units)
Concentration of Boltwoodite per GRapi unit = 240.23 (PPB)
Boltwoodite 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) 7.31 ± 1.83 grams of pure Boltwoodite .
Estimated Maximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 100 cm box) 730.71 ±182.68 grams of pure Boltwoodite .
Estimated Radioactivity from Boltwoodite 
- very strong
| SpecimenSizeWeight/Volume(Sphere) * | CalculatedActivityBecquerels(Bq) | CalculatedActivityCuries (Ci) | EstimatedActivityGR(api) | EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour |
|---|---|---|---|---|
| 1000 gm / 8.08 cm | 99,264,658 | 2.68E-03 | 4,162,622.33 | 1,368.53 |
| 100 gm / 3.75 cm | 9,926,466 | 2.68E-04 | 416,262.23 | 136.85 |
| 10 gm / 1.74 cm | 992,647 | 2.68E-05 | 41,626.22 | 13.69 |
| 1 gm / 8.08 mm | 99,265 | 2.68E-06 | 4,162.62 | 1.37 |
| 0.1 gm / 3.75 mm | 9,926 | 2.68E-07 | 416.26 | 0.14 |
| 0.01 gm / 1.74 mm | 993 | 2.68E-08 | 41.63 | 0.01 |
| 0.001 gm / 0.81 mm | 99 | 2.68E-09 | 4.16 | 0.00 |
Weight of pure Boltwoodite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.62 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
Boltwoodite Classification
Dana Class:
53.03.01.05 (53)Nesosilicate Insular SiO4 Groups and Other Anions of Complex Cations
(53.03)with (UO2)
(53.03.01)Uranophane group
53.03.01.01 Kasolite Pb(UO2)SiO4•(H2O) P 21/a 2/m
53.03.01.02 Uranophane Ca(UO2)2SiO3(OH)2•5(H2O) P 21 2
53.03.01.03 Sklodowskite (H3O)2Mg(UO2)2(SiO4)2•4(H2O) C 2/m 2/m
53.03.01.04 Cuprosklodowskite Cu[(UO2)(SiO2OH)]2•6(H2O) P1 1
53.03.01.05 Boltwoodite HK(UO2)(SiO4)•1.5(H2O) P 21 2
53.03.01.06 Natroboltwoodite (H3O)(Na,K)(UO2)SiO4•(H2O) P 212121 2 2 2
53.03.01.07 Oursinite (Co,Mg)(H3O)2[(UO2)SiO4]2•3(H2O) Aba2,Abam Ortho
53.03.01.08 Swamboite UH6(UO2)6(SiO4)6•30(H2O) P 21/a 2/m
53.03.01.09 Uranophane-beta Ca[(UO2)SiO3(OH)]2•(H2O) P 21/a 2/m
Strunz Class:
09.AK.15 09 - SILICATES (Germanates)
09.A - Nesosilicates
09.AK -Uranyl neso- and polysilicates
09.AK.15 Boltwoodite HK(UO2)(SiO4)•1.5(H2O) P 21 2
09.AK.15 Kasolite Pb(UO2)SiO4•(H2O) P 21/a 2/m
09.AK.15 Uranophane Ca(UO2)2SiO3(OH)2•5(H2O) P 21 2
09.AK.15 Natroboltwoodite (H3O)(Na,K)(UO2)SiO4•(H2O) P 212121 2 2 2
Other Boltwoodite Information
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Boltwoodite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - Philatelic Mineralogy
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - Scandinavian mineral gallery
18 - Uranium Minerals
19 - WWW-MINCRYST
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Ask about Boltwoodite here :
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Print or Cut-and-Paste your Boltwoodite Specimen Label here :
Boltwoodite
HK(UO2)(SiO4)•1.5(H2O)
Dana No: 53.03.01.05 Strunz No: 09.AK.15
Locality:
Notes: