Cejkaite Mineral Data

General Cejkaite Information

Chemical Formula:

Na4(UO2)(CO3)3

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

Empirical Formula:

Na_3.77Mg_0.02Fe²⁺_0.04(UO₂)_1.03(CO₃)_2.98

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.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Jachymov, NW Bohemia, Czech Republic. Link to MinDat.org Location Data.

Name Origin:

Named for Jiri Cejak (1929-) for his numerous contributions to the crystal chemistry of U minerals.

Synonym:

IMA1999-045

Cejkaite Image

Images:

Cejkaite

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

Cejkaite Crystallography

Axial Ratios:

a:b:c =0.9983:1:1.3839

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

Crystal System:

TriclinicSpace Group: P1 or P1

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

By Intensity(I/I_o): 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

Crystal Structure:

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Ondrus P , Skala R , Veselovsky F , Sejkora J , Vitti C , American Mineralogist , 88 (2003) p.686-693, Cejkaite, the triclinic polymorph of Na4(UO2)(CO3)3 - a new mineral, from Jachymov, Czech Republic

Physical Properties of Cejkaite

Color:

Pale yellow, Beige.

Density:

3.67

Diaphaneity:

Opaque

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Luminescence:

Fluorescent, Short UV=weak yellow, Long UV=weak greenish yellow.

Luster:

Vitreous (Glassy)

Streak:

light yellow

Optical Properties of Cejkaite

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

Optical Data:

Biaxial (?), a=1.531, g=1.645, bire=0.1140

Calculated Properties of Cejkaite

Electron Density:

Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Cejkaite =3.76 gm/cc.

Fermion Index:

Fermion Index = 0.0042818694
Boson Index = 0.9957181306

Photoelectric:

PE_Cejkaite=1,143.16 barns/electron
U=PE_Cejkaite x r_electron=3,829.64 barns/cc.

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 Becquerels (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

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

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

References:

NAME( AmMin, 88:686) PHYS. PROP.(AmMin, 88:686) OPTIC PROP.(AmMin, 88:686)

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: