Mineralogy Database

Grimselite Mineral Data

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General Grimselite Information

Help on Chemical  Formula: Chemical Formula: K3Na(UO2)(CO3)3•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K3Na(UO2)(CO3)3•(H2O)
Help on IMA Status: IMA Status: Approved IMA 1972
Help on Locality: Locality: Gerstenegg (Kabelstollen Gerstenegg-Grimsel I), Grimsel, Bern, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Grimselite + Pronunciation Say GRIMSELITE
 

Grimselite Image

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  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

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  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

Help on Axial Ratios: Axial Ratios: a:c = 1:0.88817
Help on Cell Dimensions: Cell Dimensions: a = 9.3, c = 8.26, Z = 2; V = 618.70 Den(Calc)= 3.27
Help on Crystal System: 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/Io): 5.76(1), 3.08(0.8), 8.09(0.8),
 

Physical Properties of Grimselite

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow.
Help on Density: Density: 3.3
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Streak: Streak: light yellow
 

Optical Properties of Grimselite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (-), e=1.48, w=1.601, bire=0.1210.
 

Calculated Properties of Grimselite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Grimselite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.003643768
Boson Index = 0.996356232
Help on Photoelectric: Photoelectric: PEGrimselite = 980.55 barns/electron
U=PEGrimselite x relectron=2,936.08 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: 15.02.06.01 (15)Hydrated Carbonates
  (15.02)where A+m B++n (XO3)p � 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
Help on  Strunz Class: 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

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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:

 

Notes:

 

 
   
 


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