Tadzhikite-(Y) Mineral Data

Tadzhikite-(Y) Mineral Data +

General Tadzhikite-(Y) Information

Chemical Formula:

Ca4(Y,Ce)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2

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

Empirical Formula:

Ca₄Y_1.5Ce_0.5Ti_1.2Al_0.6Fe³⁺_0.2B₄Si₄O₂₂(OH)₂

Environment:

In the replacement units of zoned pegmatite dikes.

IMA Status:

Approved IMA 1987 (Dana # Added)

Locality:

In the Dara-i-Pioz massif, Alai Range, Tien Shan, Tajikistan (Tadzhikistan). Link to MinDat.org Location Data.

Name Origin:

Named for the locality and its yttrium content.

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Tadzhikite-(Y) Crystallography

Axial Ratios:

a:b:c =3.8067:1:2.2059

Cell Dimensions:

a = 17.93, b = 4.71, c = 10.39, Z = 2; beta = 100.75° V = 862.04 Den(Calc)= 3.81

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2/a

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

By Intensity(I/I_o): 2.65(1), 1.913(0.55), 4.97(0.3),

Crystal Structure:

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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)

Color:

Brown.

Density:

3.73 - 3.86, Average = 3.79

Diaphaniety:

Translucent

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Tadzhikite-(Y)

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

Optical Data:

Biaxial (+/-), a=1.75-1.761, g=1.763-1.772, bire=0.0110-0.0130

Calculated Properties of Tadzhikite-(Y)

Electron Density:

r_electron=3.66 gm/cc
note: r_{Tadzhikite-(Y)}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.02213
Boson Index = 0.97787

Photoelectric:

PE_{Tadzhikite-(Y)}= 54.21 barns/electron
U=PE_{Tadzhikite-(Y)} x r_electron= 198.19 barns/cc.

Radioactivity:

GRapi = 7,270.43 (Gamma Ray American Petroleum Institute Units)

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

Dana Class:

54.2.2.2 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.2)with B in [4] coordination

(54.2.2)Hellandite group

54.2.2.1 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m

54.2.2.2 Tadzhikite-(Y) ! Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

54.2.2.3 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

54.2.2.4 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m

54.2.2.5 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m

54.2.2.6 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m

Strunz Class:

VIII/F.36-25 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.36 - Caysichite-(Y) - Tadzhikite-(Ce) series

VIII/F.36-02 Grumantite NaHSi2O5·(H2O) F dd2 mm2

VIII/F.36-05 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20 Ccm21 mm2

VIII/F.36-10 Hellandite-(Y) (Ca,REE)4(Y,Ce)2(Al,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-15 Hellandite-(Ce)! (Ca3REE)4Ce2Al[]2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-20 Tadzhikite-(Ce) Ca4(Ce,Y)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-25 Tadzhikite-(Y) Ca4(Y,Ce)2(Ti,Al,Fe,[])2[Si4B4O22](OH)2 P 2/a 2/m

VIII/F.36-30 Mottanaite-(Ce)! Ca4(Ce,Ca)2AlBe2[Si4B4O22]O2 P 2/a 2/m

VIII/F.36-40 Ciprianiite! Ca4[(Th,U)(REE)]2(Al,[])2[Si4B4O22](OH,F)2 P 2/a 2/m

VIII/F.36-60 Ashcroftine-(Y) K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8·8(H2O) I 4/mmm 4/m 2/m 2/m

Other Tadzhikite-(Y) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Tadzhikite-(Y) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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Tadzhikite-(Y)

Ca4(Y,Ce)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Dana No: 54.2.2.2 Strunz No: VIII/F.36-25
Locality:

Notes: