Natroboltwoodite Mineral Data

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General Natroboltwoodite Information

Chemical Formula:

(H3O)(Na,K)(UO2)SiO4•(H2O)

Composition:

Molecular Weight = 696.19 gm

Potassium 1.40 % K 1.69 % K₂O

Sodium 2.48 % Na 3.34 % Na₂O

Uranium 68.38 % U 77.57 % UO₂

Silicon 4.03 % Si 8.63 % SiO₂

Hydrogen 0.72 % H 6.47 % H₂O

Oxygen 22.98 % O

______ ______

100.00 % 97.70 % = TOTAL OXIDE

Empirical Formula:

(H₃O)Na_0.75K_0.25(UO₂)₂(SiO₄)•(H₂O)

Environment:

Oxidation zone mineral.

IMA Status:

Approved IMA 1975

Locality:

Unspecifed arid regions of the former USSR. Link to MinDat.org Location Data.

Name Origin:

Named for the composition and relationship to boltwoodite.

Synonym:

Sodium boltwoodite - Renamed to Natroboltwoodite by Mineralogical Record, v39 (2008), p131

Natroboltwoodite Image

Images:

Natroboltwoodite

Comments: Pale yellow, massive, waxy natroboltwoodite.
Location: Alluaiv Mountain, Lovozero, Russia. Scale: See Image.
© Rruff Database

Natroboltwoodite Crystallography

Axial Ratios:

a:b:c =3.9031:1:0.9472

Cell Dimensions:

a = 27.4, b = 7.02, c = 6.65, Z = 4; V = 1,279.11 Den(Calc)= 3.61

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 2₁2₁2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.92(1), 6.71(1), 4.7(0.8),

Physical Properties of Natroboltwoodite

Color:

Yellow, White.

Density:

4.1

Hardness:

3.5-4 - Copper Penny-Fluorite

Optical Properties of Natroboltwoodite

Gladstone-Dale:

CI meas= -0.207 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.371 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1743,KPDmeas= 0.1535,KC= 0.1272
Ncalc = 1.46 - 1.52

Optical Data:

Biaxial (-), a=1.613, b=1.63, g=1.645, bire=0.0320

Pleochroism (x):

colorless.

Pleochroism (z):

pale yellow.

Calculated Properties of Natroboltwoodite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Natroboltwoodite =4.10 gm/cc.

Fermion Index:

Fermion Index = 0.0069203925
Boson Index = 0.9930796075

Photoelectric:

PE_{Natroboltwoodite}=1,824.80 barns/electron
U=PE_{Natroboltwoodite} x r_electron=6,361.97 barns/cc.

Radioactivity:

GRapi = 4,956,284.34 (Gamma Ray American Petroleum Institute Units)
Concentration of Natroboltwoodite per GRapi unit = 201.76 (PPB)

Natroboltwoodite 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) 6.14 ± 1.53 grams of pure Natroboltwoodite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 613.70 ±153.42 grams of pure Natroboltwoodite .

**Estimated Radioactivity from Natroboltwoodite** - 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 / 7.75 cm	122,400,731	3.31E-03	4,956,284.34	1,629.46
100 gm / 3.60 cm	12,240,073	3.31E-04	495,628.43	162.95
10 gm / 1.67 cm	1,224,007	3.31E-05	49,562.84	16.29
1 gm / 7.75 mm	122,401	3.31E-06	4,956.28	1.63
0.1 gm / 3.60 mm	12,240	3.31E-07	495.63	0.16
0.01 gm / 1.67 mm	1,224	3.31E-08	49.56	0.02
0.001 gm / 0.78 mm	122	3.31E-09	4.96	0.00

Weight of pure Natroboltwoodite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.10 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

Natroboltwoodite Classification

Dana Class:

53.03.01.06 (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 Natroboltwoodite Information

References:

NAME( Dana8) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Natroboltwoodite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Natroboltwoodite

(H3O)(Na,K)(UO2)SiO4•(H2O)
Dana No: 53.03.01.06 Strunz No: 09.AK.15
Locality:

Notes: