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Tadzhikite-(Ce) Mineral Data

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General Tadzhikite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: Ca4(Ce,Y)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Help on Composition: Composition: Molecular Weight = 998.93 gm
   Calcium   16.05 %  Ca   22.46 % CaO
   Cerium    21.04 %  Ce   24.64 % Ce2O3
   Yttrium    4.45 %  Y     5.65 % Y2O3
   Titanium   2.88 %  Ti    4.80 % TiO2
   Aluminum   0.81 %  Al    1.53 % Al2O3
   Iron       0.56 %  Fe    0.80 % Fe2O3
   Silicon   11.25 %  Si   24.06 % SiO2
   Boron      4.33 %  B    13.94 % B2O3
   Hydrogen   0.20 %  H     1.80 % H2O
   Oxygen    38.44 %  O
            ______        ______ 
            100.00 %       99.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Ce1.5Y0.5Ti0.6Al0.3Fe3+0.1B4Si4O22(OH)2
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: In the Dara-i-Pioz massif, Alai Range, Tien Shan, Tajikistan (Tadzhikistan). Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality and its cerium content.
Help on Name Pronunciation: Name Pronunciation: Tadzhikite-(Ce) + Pronunciation Say TADZHIKITE-(CE)
Help on Synonym: Synonym: ICSD 20528
  IMA2000-F
  PDF 24-137
  Tadzhikite
 

Tadzhikite-(Ce) Image

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  Tadzhikite-(Ce)

Comments: Brown crystal of tadzhikite-(Ce) with baratovite, polylithionite and zektzerite in matrix.
Location: Dara-I-Pioz, Tajikistan. Scale: Specimen Size 1.5x2 cm.
© Diederik Visser

Tadzhikite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.8067:1:2.2059
Help on Cell Dimensions: Cell Dimensions: a = 17.93, b = 4.71, c = 10.39, Z = 2; beta = 100.75° V = 862.04 Den(Calc)= 3.85
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.65(1), 1.913(0.55), 4.97(0.3),
 

Physical Properties of Tadzhikite-(Ce)

Help on Cleavage: Cleavage: {010} Distinct
Help on Color: Color: Gray brown, Reddish brown.
Help on Density: Density: 3.73 - 3.86, Average = 3.79
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Tadzhikite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1978,KPDmeas= 0.2007,KC= 0.2029
Ncalc = 1.76 - 1.78
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.75-1.761, g=1.763-1.772, bire=0.0110-0.0130, 2V(Meas)=80-92.
 

Calculated Properties of Tadzhikite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Tadzhikite-(Ce) =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETadzhikite-(Ce) = 110.60 barns/electron
U=PETadzhikite-(Ce) x relectron= 400.17 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 21,397.15 (Gamma Ray American Petroleum Institute Units)
Concentration of Tadzhikite-(Ce) per GRapi unit = 46.74 (PPM)

Tadzhikite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Tadzhikite-(Ce) - weak
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 / 7.95 cm 471,292 1.27E-05 21,397.15 7.03
100 gm / 3.69 cm 47,129 1.27E-06 2,139.72 0.70
10 gm / 1.71 cm 4,713 1.27E-07 213.97 0.07
1 gm / 7.95 mm 471 1.27E-08 21.40 0.01
0.1 gm / 3.69 mm 47 1.27E-09 2.14 0.00
0.01 gm / 1.71 mm 5 1.27E-10 0.21 0.00
0.001 gm / 0.80 mm 0 1.27E-11 0.02 0.00

Weight of pure Tadzhikite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 3.80 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
Estimated Thorium Activity ( 1.05 % Th) From Sum REE Elements (21.04 % REE)
 

Tadzhikite-(Ce) Classification

Help on  Dana Class: Dana Class: 54.02.02.03 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02)with B in [4] coordination
  (54.02.02)Hellandite group
 
54.02.02.01 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.02 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.03 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.04 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
 
54.02.02.05 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
 
54.02.02.06 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
 
54.02.02.07 Piergorite-(Ce)! Ca8Ce2(Al0.5Fe0.5)([],Li,Be)2Si6B8O36(OH,F)2 P 2/a 2/m
Help on  Strunz Class: Strunz Class: 09.DK.20 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DK -Inosilicates with 5-periodic single chains
 
09.DK.20 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Tadzhikite-(Y)! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m
 
09.DK.20 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m
 
09.DK.20 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m
 

Other Tadzhikite-(Ce) 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 Tadzhikite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - WWW-MINCRYST

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Print or Cut-and-Paste your Tadzhikite-(Ce) Specimen Label here :

Tadzhikite-(Ce)

Ca4(Ce,Y)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Dana No: 54.02.02.03 Strunz No: 09.DK.20
Locality:

 

Notes:

 

 
   
 


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