Tadzhikite-(Ce) Mineral Data

Advertisment

Adamsminerals.com- Online mineral store front for mineral collectors

For more than thirty (30) years, Excalibur Mineral Corp. has been providing private collectors, researchers, major universities and museums throughout the world with reliably identified, rare and unusual mineral samples for science an

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

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.

Name Pronunciation:

Tadzhikite-(Ce) + Pronunciation

Synonym:

ICSD 20528

IMA2000-F

PDF 24-137

Tadzhikite

Tadzhikite-(Ce) Image

Images:

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

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
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, Locality: Dara-i-Pioz, Tadzhikistan

Physical Properties of Tadzhikite-(Ce)

Cleavage:

{010} Distinct

Color:

Gray brown, Reddish brown.

Density:

3.73 - 3.86, Average = 3.79

Diaphaneity:

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
Ncalc = 1.76 - 1.78

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:

Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Tadzhikite-(Ce) =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

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 Becquerels (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

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

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

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 - 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

Search for Tadzhikite-(Ce) using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Tadzhikite-(Ce) :

A Bijoux Google Search for Tadzhikite-(Ce)
Adam's Minerals Google Search for Tadzhikite-(Ce)
Cape Minerals Google Search for Tadzhikite-(Ce)
Dakota Matrix Minerals Google Search for Tadzhikite-(Ce)
Excalibur Mineral Corp. Google Search for Tadzhikite-(Ce)
Exceptional Minerals Google Search for Tadzhikite-(Ce)
John Betts Fine Minerals Search for Tadzhikite-(Ce)
McDougall Minerals Google Search for Tadzhikite-(Ce)
Mineral News Website Link
Rock and Mineral Shows Google Search for Tadzhikite-(Ce)
Weinrich Minerals, Inc. Google Search for Tadzhikite-(Ce)

Ask about Tadzhikite-(Ce) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: