Grimselite Mineral Data

General Grimselite Information

Chemical Formula:

K3Na(UO2)(CO3)3•(H2O)

Composition:

Molecular Weight = 608.36 gm

Potassium 19.28 % K 23.23 % K₂O

Sodium 3.78 % Na 5.09 % Na₂O

Uranium 39.13 % U 44.39 % UO₂

Hydrogen 0.33 % H 2.96 % H₂O

Carbon 5.92 % C 21.70 % CO₂

Oxygen 31.56 % O

______ ______

100.00 % 97.37 % = TOTAL OXIDE

Empirical Formula:

K₃Na(UO₂)(CO₃)₃•(H₂O)

IMA Status:

Approved IMA 1972

Locality:

Gerstenegg (Kabelstollen Gerstenegg-Grimsel I), Grimsel, Bern, Switzerland. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Grimselite + Pronunciation

Grimselite Image

Images:

Grimselite

Comments: Small yellow crystals of grimselite in matrix.
Location: Gerstenegg/Sommerloch tunnel, Grimsel Region, Hasli Valley, Bern, Switzerland. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Grimselite

Comments: Bright yellow coatings and minor, small crystals of grimselite on a white quartz matrix..
Location: Gerstenegg - Sommerloch Tunnel, Grimsel, Hasli Tal, Bern, Schweiz (Switzerland).. Scale: See Image.
© Paul M. Schumacher

Grimselite Crystallography

Axial Ratios:

a:c = 1:0.88817

Cell Dimensions:

a = 9.3, c = 8.26, Z = 2; V = 618.70 Den(Calc)= 3.27

Crystal System:

Hexagonal - Ditrigonal Dipyramidal H-M Symbol (6 m2) Space Group: P 62c

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

By Intensity(I/I_o): 5.76(1), 3.08(0.8), 8.09(0.8),

Physical Properties of Grimselite

Cleavage:

None

Color:

Yellow.

Density:

3.3

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

2-2.5 - Gypsum-Finger Nail

Streak:

light yellow

Optical Properties of Grimselite

Gladstone-Dale:

CI meas= -0.054 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1653,KPDmeas= 0.1638,KC= 0.1554
Ncalc = 1.51

Optical Data:

Uniaxial (-), e=1.48, w=1.601, bire=0.1210.

Calculated Properties of Grimselite

Electron Density:

Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Grimselite =3.30 gm/cc.

Fermion Index:

Fermion Index = 0.003643768
Boson Index = 0.996356232

Photoelectric:

PE_Grimselite= 980.55 barns/electron
U=PE_Grimselite x r_electron=2,936.08 barns/cc.

Radioactivity:

GRapi = 3,026,385.30 (Gamma Ray American Petroleum Institute Units)
Concentration of Grimselite per GRapi unit = 330.43 (PPB)

Grimselite 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) 10.05 ± 2.51 grams of pure Grimselite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 1005.0 ±251.26 grams of pure Grimselite .

**Estimated Radioactivity from Grimselite** - 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 / 8.33 cm	70,042,508	1.89E-03	3,026,385.30	994.98
100 gm / 3.87 cm	7,004,251	1.89E-04	302,638.53	99.50
10 gm / 1.80 cm	700,425	1.89E-05	30,263.85	9.95
1 gm / 8.33 mm	70,043	1.89E-06	3,026.39	0.99
0.1 gm / 3.87 mm	7,004	1.89E-07	302.64	0.10
0.01 gm / 1.80 mm	700	1.89E-08	30.26	0.01
0.001 gm / 0.83 mm	70	1.89E-09	3.03	0.00

Weight of pure Grimselite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.30 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

Grimselite Classification

Dana Class:

15.02.06.01 (15)Hydrated Carbonates

(15.02)where A+m B++n (XO3)p ï¿½ x(H2O), (m+n):p > 1:1

(15.02.06)Dana Group

15.02.06.01 Grimselite K3Na(UO2)(CO3)3•(H2O) P 62c 6 m2

Strunz Class:

05.ED.35 05 - CARBONATES (NITRATES)

05.E - Uranyl Carbonates

05.ED -UO2:CO3 = 1:3

05.ED.35 Grimselite K3Na(UO2)(CO3)3•(H2O) P 62c 6 m2

Other Grimselite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Grimselite :
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 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - Uranium Minerals

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

Grimselite

K3Na(UO2)(CO3)3•(H2O)
Dana No: 15.02.06.01 Strunz No: 05.ED.35
Locality:

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