Tadzhikite-(Y) Mineral Data

[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed

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.

Name Pronunciation:

Tadzhikite-(Y) + Pronunciation

Tadzhikite-(Y) Image

Images:

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

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:

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

Physical Properties of Tadzhikite-(Y)

Color:

Brown.

Density:

3.73 - 3.86, Average = 3.79

Diaphaneity:

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
Ncalc = 1.84 - 1.87

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:

Bulk Density (Electron Density)=3.66 gm/cc
note: Specific Gravity of Tadzhikite-(Y) =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

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)
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

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

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

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 (UofA)
6 - MinDAT
7 - MinMax(Deutsch)
8 - MinMax(English)
9 - Mineralienatlas (Deutsch)
10 - QUT Mineral Atlas
11 - Ruff.Info

Search for Tadzhikite-(Y) using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tadzhikite-(Y) :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Tadzhikite-(Y) Mineral Data :

Ask about Tadzhikite-(Y) 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-(Y) Specimen Label here :

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: