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Cejkaite Mineral Data

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General Cejkaite Information

Help on Chemical  Formula: Chemical Formula: Na4(UO2)(CO3)3
Help on Composition: Composition: Molecular Weight = 546.35 gm
   Sodium     15.86 %  Na   21.38 % Na2O
   Magnesium   0.09 %  Mg    0.15 % MgO
   Uranium    44.87 %  U    50.91 % UO2
   Iron        0.41 %  Fe    0.53 % FeO
   Carbon      6.55 %  C    24.00 % CO2
   Oxygen     32.21 %  O
             ______        ______ 
             100.00 %       96.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3.77Mg0.02Fe2+0.04(UO2)1.03(CO3)2.98
Help on Environment: Environment: Secondary mineral associated with decomposed uraninite. Formed in a relatively dry environment in a restricted pH (6.5-11.5, non-acidic) range. Related to grimselite.
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Jachymov, NW Bohemia, Czech Republic. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Jiri Cejak (1929-) for his numerous contributions to the crystal chemistry of U minerals.
Help on Synonym: Synonym: IMA1999-045
 

Cejkaite Image

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  Cejkaite

Comments: Yellow chalky cejkaite masses on matrix.
Location: Svornost Mine, Jáchymov, Ostrov, Krusne Hory Mts (Erzgebirge), Bohemia, Czech Republic. Scale: Picture Size 0.5 cm.
© Jeff Weissman / Photographic Guide to Mineral Species

Cejkaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9983:1:1.3839
Help on Cell Dimensions: Cell Dimensions: a = 9.28, b = 9.295, c = 12.864, Z = 4; alpha = 90.293°, beta = 91.124°, gamma = 119.548° V = 965.11 Den(Calc)= 3.76
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.639(1)(1+20,210,110), 8.022(0.92)(110,010,100)4.967(0.68)(012,102), 3.221(0.63)(004), 2.681(0.6)(330,114,0305.024(0.6)(112
 

Physical Properties of Cejkaite

Help on Color: Color: Pale yellow, Beige.
Help on Density: Density: 3.67
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Luminescence: Luminescence: Fluorescent, Short UV=weak yellow, Long UV=weak greenish yellow.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light yellow
 

Optical Properties of Cejkaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.117 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.09 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1564,KPDmeas= 0.1602,KC= 0.1435
Ncalc = 1.53 - 1.54
Help on Optical Data: Optical Data: Biaxial (?), a=1.531, g=1.645, bire=0.1140
 

Calculated Properties of Cejkaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Cejkaite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0042818694
Boson Index = 0.9957181306
Help on Photoelectric: Photoelectric: PECejkaite =1,143.16 barns/electron
U=PECejkaite x relectron=3,829.64 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 3,407,969.63 (Gamma Ray American Petroleum Institute Units)
Concentration of Cejkaite per GRapi unit = 293.43 (PPB)

Cejkaite 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) 8.93 ± 2.23 grams of pure Cejkaite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 892.52 ±223.13 grams of pure Cejkaite .

Estimated Radioactivity from Cejkaite - 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 / 7.98 cm 80,325,068 2.17E-03 3,407,969.63 1,120.43
100 gm / 3.70 cm 8,032,507 2.17E-04 340,796.96 112.04
10 gm / 1.72 cm 803,251 2.17E-05 34,079.70 11.20
1 gm / 7.98 mm 80,325 2.17E-06 3,407.97 1.12
0.1 gm / 3.70 mm 8,033 2.17E-07 340.80 0.11
0.01 gm / 1.72 mm 803 2.17E-08 34.08 0.01
0.001 gm / 0.80 mm 80 2.17E-09 3.41 0.00

Weight of pure Cejkaite in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.76 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
 

Cejkaite Classification

Help on  Dana Class: Dana Class: 14.01.07.01 (14)Anhydrous Carbonates
  (14.01)with Simple Formula A+ CO3
  (14.01.07)Dana Group
 
14.01.07.01 Cejkaite! Na4(UO2)(CO3)3 P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 05.ED.50 05 - CARBONATES (NITRATES)
  05.E - Uranyl Carbonates
  05.ED -UO2:CO3 = 1:3
 
05.ED.50 Cejkaite! Na4(UO2)(CO3)3 P1 or P1 Tri
 

Other Cejkaite Information

Help on References: References: NAME( AmMin, 88:686) PHYS. PROP.(AmMin, 88:686) OPTIC PROP.(AmMin, 88:686)
Help on See Also: See Also: Links to other databases for Cejkaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - Uranium Minerals

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

Cejkaite

Na4(UO2)(CO3)3
Dana No: 14.01.07.01 Strunz No: 05.ED.50
Locality:

 

Notes:

 

 
   
 


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