Thoreaulite Mineral Data

Thoreaulite Mineral Data +

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General Thoreaulite Information

Chemical Formula:

Sn++Ta2O6

Composition:

Molecular Weight = 576.60 gm

Tantalum 62.76 % Ta 76.64 % Ta₂O₅

Tin 20.59 % Sn 23.36 % SnO

Oxygen 16.65 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SnTa₂O₆

Environment:

Secondary mineral in cassiterite-bearing rocks.

IMA Status:

Valid Species (Pre-IMA) 1933

Locality:

Manono, Shaba, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for Jacques Thoreau (188-1971), University of Louvain, Belogium.

Synonym:

ICSD 15206

PDF 44-1411

Thoreaulite Image

Images:

Thoreaulite

Comments: Yellow thoreaulite grain.
Location: Ognevka Ta Deposit, Kalba Range, Shyghys Qazaqstan Oblysy (Vostochno-Kazakhstanskaya [Eastern-Kazakhstan] Oblast'), Kazakhstan. Scale: Grain size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Thoreaulite Crystallography

Axial Ratios:

a:b:c =3.5231:1:1.1403

Cell Dimensions:

a = 17.14, b = 4.865, c = 5.548, Z = 4; beta = 91° V = 462.56 Den(Calc)= 8.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.07(1), 3.1(1), 2.86(0.8),

Crystal Structure:

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Mumme W G , American Mineralogist , 55 (1970) p.367-377, The crystal structure of SnTa2O7, thoreaulite, an example of tin in five-fold, coordination

Physical Properties of Thoreaulite

Cleavage:

[100] Perfect, [011] Indistinct

Color:

Brown, Yellowish, Yellow brown, Resin brown.

Density:

7.6 - 7.9, Average = 7.75

Diaphaniety:

Translucent to Subopaque

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Adamantine - Resinous

Streak:

light yellow

Optical Properties of Thoreaulite

Gladstone-Dale:

CI meas= -0.255 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.174 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1743,KPDmeas= 0.1862,KC= 0.1484

Optical Data:

Biaxial (+), a=2.39, b=2.42, g=2.52, bire=0.1300, 2V(Calc)=60, 2V(Meas)=25-35.

Calculated Properties of Thoreaulite

Electron Density:

r_electron=7.01 gm/cc
note: r_Thoreaulite=8.28 gm/cc.

Fermion Index

Fermion Index = 0.03437
Boson Index = 0.96563

Photoelectric:

PE_Thoreaulite= 830.65 barns/electron
U=PE_Thoreaulite x r_electron=5,820.90 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Thoreaulite is Not Radioactive

Thoreaulite Classification

Dana Class:

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

(8.3)where A (B2O6)

(8.3.10)Dana Group

8.3.10.1 Thoreaulite SnTa2O6 C 2/c 2/m

8.3.10.2 Foordite Sn(Nb,Ta)2O6 C 2/c 2/m

Strunz Class:

IV/D.29-20 IV - Oxides

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

IV/D.29 - Badleyite - Uraninite series, Foordite - Thoreaulite

IV/D.29-10 Foordite Sn(Nb,Ta)2O6 C 2/c 2/m

IV/D.29-20 Thoreaulite SnTa2O6 C 2/c 2/m

Other Thoreaulite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Thoreaulite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Thoreaulite

Sn++Ta2O6
Dana No: 8.3.10.1 Strunz No: IV/D.29-20
Locality:

Notes: