Stibiotantalite Mineral Data

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

IMA Status:

Valid Species (Pre-IMA) 1893

Locality:

Link to MinDat.org Location Data.

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

Diaphaniety:

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

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:

r_electron=6.44 gm/cc
note: r_{Stibiotantalite}=7.57 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stibiotantalite is Not Radioactive

Stibiotantalite Classification

Dana Class:

8.1.6.2 (8)Multiple Oxides with Nb, Ta, and Ti

(8.1)where A BO4

(8.1.6)Dana Group

8.1.6.1 Stibiocolumbite SbNbO4 Pc21n mm2

8.1.6.2 Stibiotantalite SbTaO4 Pc21n mm2

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

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

Strunz Class:

IV/D.25-30 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.25 - Cervantite - Chiluite series

IV/D.25-05 Clinocervantite! SbSbO4 C 2/c 2/m

IV/D.25-10 Cervantite SbSbO4 Pbn21 mm2

IV/D.25-20 Stibiocolumbite SbNbO4 Pc21n mm2

IV/D.25-30 Stibiotantalite SbTaO4 Pc21n mm2

IV/D.25-35 Bismutocolumbite Bi(Nb,Ta)O4 Pcnn 2/m 2/m 2/m

IV/D.25-40 Bismutotantalite Bi(Ta,Nb)O4 Pcmn 2/m 2/m 2/m

IV/D.25-70 Chiluite Bi6Te2Mo2O21 P 6₃22, P 6₃/m, P 6₃ Hex

Other Stibiotantalite Information

References:

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

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Stibiotantalite

SbTaO4
Dana No: 8.1.6.2 Strunz No: IV/D.25-30
Locality:

Notes: