Yttrotantalite-(Y) Mineral Data

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Yttrotantalite-(Y) Information

Chemical Formula:

(Y,U,Fe++)(Ta,Nb)O4

Composition:

Molecular Weight = 315.74 gm

Yttrium 19.71 % Y 25.03 % Y₂O₃

Uranium 7.54 % U 8.55 % UO₂

Tantalum 40.12 % Ta 48.98 % Ta₂O₅

Niobium 8.83 % Nb 12.63 % Nb₂O₅

Iron 3.54 % Fe 4.55 % FeO

Oxygen 20.27 % O

______ ______

100.00 % 99.75 % = TOTAL OXIDE

Empirical Formula:

Y_0.7Fe²⁺_0.2U_0.1Ta_0.7Nb_0.3O₄

Environment:

Accessory mineral in granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1802

Locality:

Ytterby, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for its YTTRium content and relation to tantalite.

Name Pronunciation:

Yttrotantalite-(Y) + Pronunciation

Yttrotantalite-(Y) Image

Images:

Yttrotantalite-(Y)

Comments: Dark greenish-black crystal of Yttrotantalite-(Y).
Location: Ytterby, Resarö, Vaxholm, Stockholm, Sweden. Scale: Picture size 8 mm.
© Thomas Witzke / Abraxas-Verlag

Yttrotantalite-(Y) Crystallography

Axial Ratios:

a:b:c =0.4881:1:0.4634

Cell Dimensions:

a = 5.34, b = 10.94, c = 5.07, Z = 3; beta = 95.3° V = 294.92 Den(Calc)= 5.33

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 2.95(1), 1.81(0.9), 1.55(0.9),2.56(0.6), 1.183(0.6), 1.152(0.6), 1.053(0.5),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: ( 2 1 0) ( 0 1 1) ( 0 1 0) ( 1 1 0) ( 0 0 1)

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Physical Properties of Yttrotantalite-(Y)

Cleavage:

{010} Imperfect

Color:

Brownish black, Yellowish brown, Yellow.

Density:

5.5 - 5.9, Average = 5.7

Diaphaneity:

Opaque to subtranslucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

5-5.5 - Apatite-Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Sub Metallic

Streak:

colorless gray

Optical Properties of Yttrotantalite-(Y)

Gladstone-Dale:

CI meas= -0.205 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.288 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2158,KPDmeas= 0.2018,KC= 0.1675
Ncalc = 1.89 - 1.99

Optical Data:

Isotropic, n=2.15.

Calculated Properties of Yttrotantalite-(Y)

Electron Density:

Bulk Density (Electron Density)=4.95 gm/cc
note: Specific Gravity of Yttrotantalite-(Y) =5.70 gm/cc.

Fermion Index:

Fermion Index = 0.0014381814
Boson Index = 0.9985618186

Photoelectric:

PE_{Yttrotantalite-(Y)}= 714.82 barns/electron
U=PE_{Yttrotantalite-(Y)} x r_electron=3,538.41 barns/cc.

Radioactivity:

GRapi = 558,050.16 (Gamma Ray American Petroleum Institute Units)
Concentration of Yttrotantalite-(Y) per GRapi unit =1,791.95 (PPB)

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

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 54.51 ± 13.63 grams of pure Yttrotantalite-(Y) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5450.5 ±1362.6 grams of pure Yttrotantalite-(Y) .

**Estimated Radioactivity from Yttrotantalite-(Y)** - strong
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 / 6.95 cm	13,494,410	3.65E-04	558,050.16	183.47
100 gm / 3.22 cm	1,349,441	3.65E-05	55,805.02	18.35
10 gm / 1.50 cm	134,944	3.65E-06	5,580.50	1.83
1 gm / 6.95 mm	13,494	3.65E-07	558.05	0.18
0.1 gm / 3.22 mm	1,349	3.65E-08	55.81	0.02
0.01 gm / 1.50 mm	135	3.65E-09	5.58	0.00
0.001 gm / 0.69 mm	13	3.65E-10	0.56	0.00

Weight of pure Yttrotantalite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.70 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

Yttrotantalite-(Y) Classification

Dana Class:

08.01.03.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.01)where A BO4

(08.01.03)Yttroantalalite-Yttrocolumbite Series

08.01.03.01 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

08.01.03.02 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho

08.01.03.03 Iwashiroite-(Y)! YTaO4 P 2/a 2/m

Strunz Class:

04.DG.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DG -With large (± medium-sized) cations; chains of edge-sharing octahedra

04.DG.10 Fergusonite-beta-(Nd) (Nd,Ce)NbO4 I2 2

04.DG.10 Fergusonite-beta-(Y) YNbO4 I2 2

04.DG.10 Fergusonite-beta-(Ce) (Ce,La,Nd)NbO4 I2 2

04.DG.10 Yttrotantalite-(Y) (Y,U,Fe)(Ta,Nb)O4 I2/a 2/m

Other Yttrotantalite-(Y) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

Search for Yttrotantalite-(Y) using:

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

Visit our Advertisers for Yttrotantalite-(Y) :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Diamond Dan Publications

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Yttrotantalite-(Y) Mineral Data :

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

Yttrotantalite-(Y)

(Y,U,Fe++)(Ta,Nb)O4
Dana No: 08.01.03.01 Strunz No: 04.DG.10
Locality:

Notes: