Stibiotantalite Mineral Data

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General Stibiotantalite Information

Chemical Formula:

SbTaO4

Composition:

Molecular Weight = 366.70 gm

Tantalum 49.35 % Ta 60.25 % Ta₂O₅

Antimony 33.20 % Sb 41.93 % SbO₂

Oxygen 17.45 % O

______ ______

100.00 % 102.18 % = TOTAL OXIDE

Empirical Formula:

SbTaO₄

Environment:

Accessory mineral in complex granite pegmatites.

IMA Status:

Valid Species (Pre-IMA) 1893

Locality:

Greenbushes tin placers, Wodgina district, Western Australia. Link to MinDat.org Location Data.

Name Origin:

Named from the Latin for antimony, STIBIum, in the composition, and relation to tantalite.

Name Pronunciation:

Stibiotantalite + Pronunciation

Synonym:

ICSD 25548

PDF 16-908

Stibiotantalite Image

Images:

Stibiotantalite

Comments: Translucent stibiotantalite crystal.
Location: Himalaya Mine, Mesa Grande, San Diego County, California, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Stibiotantalite Crystallography

Axial Ratios:

a:b:c =0.4156:1:0.4724

Cell Dimensions:

a = 4.9, b = 11.79, c = 5.57, Z = 4; V = 321.78 Den(Calc)= 7.57

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Pc21n

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

By Intensity(I/I_o): 3.13(1), 2.96(0.6), 3.55(0.6),

Forms:

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

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Crystal Structure:

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Dihlstrom K , Zeitschrift fur Anorganische und Allgemeine Chemie , 239 (1938) p.57-64, Uber den bau des wahren antimontetroxyds und des damit isomorphen, stibiotantalits, SbTaO4, Locality: Grande Mesa, California, USA

Physical Properties of Stibiotantalite

Cleavage:

{???} Perfect

Color:

Brown, Greenish yellow, Yellow, Light yellow brown, Dark brown.

Density:

6 - 7.4, Average = 6.7

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Adamantine - Resinous

Magnetism:

Nonmagnetic

Streak:

light yellow

Optical Properties of Stibiotantalite

Gladstone-Dale:

CI meas= -1.316 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.05 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1865,KPDmeas= 0.2107,KC= 0.091
Ncalc = 1.55 - 1.69

Optical Data:

Biaxial (+), a=2.3742, b=2.4039, g=2.4568, bire=0.0826, 2V(Calc)=76, 2V(Meas)=75.083. Dispersion relatively strong.

Calculated Properties of Stibiotantalite

Electron Density:

Bulk Density (Electron Density)=6.44 gm/cc
note: Specific Gravity of Stibiotantalite =7.57 gm/cc.

Fermion Index:

Fermion Index = 0.0001429867
Boson Index = 0.9998570133

Photoelectric:

PE_{Stibiotantalite}= 711.98 barns/electron
U=PE_{Stibiotantalite} x rElectron Density=4,585.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stibiotantalite is Not Radioactive

Stibiotantalite Classification

Dana Class:

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

(08.01)where A BO4

(08.01.06)Stibiocolumbite Group

08.01.06.01 Stibiocolumbite SbNbO4 Pc21n mm2

08.01.06.02 Stibiotantalite SbTaO4 Pc21n mm2

08.01.06.03 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

08.01.06.04 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

Strunz Class:

04.DE.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

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

04.DE -With medium-sized cations; with various polyhedra

04.DE.30 Cervantite SbSbO4 Pbn21 mm2

04.DE.30 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

04.DE.30 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

04.DE.30 Clinocervantite! SbSbO4 C 2/c 2/m

04.DE.30 Stibiocolumbite SbNbO4 Pc21n mm2

04.DE.30 Stibiotantalite SbTaO4 Pc21n mm2

Other Stibiotantalite 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 Stibiotantalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Stibiotantalite

SbTaO4
Dana No: 08.01.06.02 Strunz No: 04.DE.30
Locality:

Notes: