Tadzhikite-(Ce) Mineral Data

Tadzhikite-(Ce) Mineral Data +

General Tadzhikite-(Ce) Information

Chemical Formula:

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

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

Empirical Formula:

Ca₄Ce_1.5Y_0.5Ti_0.6Al_0.3Fe³⁺_0.1B₄Si₄O₂₂(OH)₂

IMA Status:

Approved IMA 1987

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 cerium content.

Synonym:

ICSD 20528

IMA2000-F

PDF 24-137

Tadzhikite

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Tadzhikite-(Ce) 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)= 3.85

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),

Physical Properties of Tadzhikite-(Ce)

Cleavage:

[010] Distinct

Color:

Gray brown, Reddish brown.

Density:

3.73 - 3.86, Average = 3.79

Diaphaniety:

Translucent

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tadzhikite-(Ce)

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

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)

Electron Density:

r_electron=3.62 gm/cc
note: r_{Tadzhikite-(Ce)}=3.80 gm/cc.

Fermion Index

Fermion Index = 0.0181
Boson Index = 0.9819

Photoelectric:

PE_{Tadzhikite-(Ce)}= 110.60 barns/electron
U=PE_{Tadzhikite-(Ce)} x r_electron= 400.17 barns/cc.

Radioactivity:

GRapi = 21,397.14 (Gamma Ray American Petroleum Institute Units)

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	21,397.14	7.03
100 gm / 3.69 cm	47,129	1.27E-06	2,139.71	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

Dana Class:

54.2.2.3 (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.36-20 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-(Ce) Information

References:

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

See Also:

Links to other databases for Tadzhikite-(Ce) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Tadzhikite-(Ce)

Ca4(Ce,Y)2(Ti,Al,Fe+++,[ ])2[Si4B4O22](OH)2
Dana No: 54.2.2.3 Strunz No: VIII/F.36-20
Locality:

Notes: