Tadzhikite-(Y) Mineral Data

Tadzhikite-(Y) Mineral Data
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General Tadzhikite-(Y) Information

Help on Chemical Formula: Chemical Formula: Ca4(Y,Ce)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Help on Composition: Composition: Molecular Weight = 990.13 gm
   Calcium   16.19 %  Ca   22.65 % CaO
   Cerium     7.08 %  Ce    8.29 % Ce2O3
   Yttrium   13.47 %  Y    17.10 % Y2O3
   Titanium   5.80 %  Ti    9.68 % TiO2
   Aluminum   1.64 %  Al    3.09 % Al2O3
   Iron       1.13 %  Fe    1.61 % Fe2O3
   Silicon   11.35 %  Si   24.27 % SiO2
   Boron      4.37 %  B    14.06 % B2O3
   Hydrogen   0.20 %  H     1.82 % H2O
   Oxygen    38.78 %  O
            ______        ______ 
            100.00 %      102.59 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca4Y1.5Ce0.5Ti1.2Al0.6Fe3+0.2B4Si4O22(OH)2
Help on Environment: Environment: In the replacement units of zoned pegmatite dikes.
Help on IMA Status: IMA Status: Approved IMA 1987 (Dana # Added)
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 yttrium content.
Help on Name Pronunciation: Name Pronunciation: Tadzhikite-(Y) + Pronunciation Say TADZHIKITE-(Y)
 

Tadzhikite-(Y) Image

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Tadzhikite-(Y)

Comments: Grayish brown crystals of tadzhikite-(Y) in matrix.
Location: Dara-i-Pioz Glacier, Alayskiy (Alai) Range, Tien Shan Mountains, Tajikistan. Scale: See Image.
© Rruff Database

Tadzhikite-(Y) 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)= 3.81
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-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),
Click Here for Large Tadzhikite-(Y) Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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 Help on Above


Hawthorne F C , Cooper M A , Taylor M C , The Canadian Mineralogist , 36 (1998) p.817-822, Refinement of the crystal structure of Tadzhikite

 

Physical Properties of Tadzhikite-(Y)

Help on Color: Color: 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)
 

Optical Properties of Tadzhikite-(Y)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.108 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.112 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1999,KPDmeas= 0.2007,KC= 0.225
Ncalc = 1.84 - 1.87
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.75-1.761, g=1.763-1.772, bire=0.0110-0.0130
 

Calculated Properties of Tadzhikite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.66 gm/cc
note: Specific Gravity of Tadzhikite-(Y) =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PETadzhikite-(Y) = 54.21 barns/electron
U=PETadzhikite-(Y) x relectron= 198.19 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7,270.43 (Gamma Ray American Petroleum Institute Units)
Concentration of Tadzhikite-(Y) per GRapi unit = 137.54 (PPM)

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

Estimated Radioactivity from Tadzhikite-(Y) - mild
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 158,494 4.28E-06 7,270.43 2.39
100 gm / 3.69 cm 15,849 4.28E-07 727.04 0.24
10 gm / 1.71 cm 1,585 4.28E-08 72.70 0.02
1 gm / 7.95 mm 158 4.28E-09 7.27 0.00
0.1 gm / 3.69 mm 16 4.28E-10 0.73 0.00
0.01 gm / 1.71 mm 2 4.28E-11 0.07 0.00
0.001 gm / 0.80 mm 0 4.28E-12 0.01 0.00

Weight of pure Tadzhikite-(Y) 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 ( 0.35 % Th) From Sum REE Elements ( 7.08 % REE)
 

Tadzhikite-(Y) Classification
Help on Dana Class: Dana Class: 54.02.02.02 (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-(Y) Information
Help on References: References: NAME( AntBidBlaNic2) 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-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Tadzhikite-(Y)

Ca4(Y,Ce)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Dana No: 54.02.02.02 Strunz No: 09.DK.20
Locality:

 

Notes: