Steropesite Mineral Data

General Steropesite Information

Chemical Formula:

Tl3BiCl6

Composition:

Molecular Weight = 1,077.12 gm

Sodium 0.02 % Na 0.03 % Na₂O

Thallium 54.84 % Tl 56.98 % Tl₂O

Bismuth 23.48 % Bi 26.17 % Bi₂O₃

Bromine 4.15 % Br 4.15 % Br

- % Br -0.42 % -O=Br₂

Chlorine 17.51 % Cl 17.51 % Cl

- % Cl -3.95 % -O=Cl₂

______ ______

100.00 % 100.48 % = TOTAL OXIDE

Empirical Formula:

Tl_2.89Na_0.01Bi_1.21Cl_5.32Br_0.56

Environment:

Found in an active high-temperature fumarole (~450 deg. C).

IMA Status:

Approved IMA 2008 (Dana # Added)

Locality:

La Fossa crater, Vulcano, Aeolian Islands, Italy Link to MinDat.org Location Data.

Name Origin:

Name is after Steropes, one of the three Cyclops and a son of Uranus. This mythological half-god was a helper of Hephaistos, the ancient Greek god of fire.

Synonym:

IMA2008-014

Steropesite Image

Images:

Steropesite

Comments: SEM-BSE image of steropesite showing a more complex habit of some crystals. (CanMin, v47:373).
Location: La Fossa crater, Vulcano, Aeolian Islands, Italy. Scale: See Image.
© Canadian Mineralogist

Steropesite Crystallography

Axial Ratios:

a:b:c =1.7641:1:0.8603

Cell Dimensions:

a = 26.686, b = 15.127, c = 13.014, Z = 16; beta = 108.11° V = 4,993.23 Den(Calc)= 5.73

Crystal System:

Monoclinic - Domatic H-M Symbol (m) Space Group: Cc

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

By Intensity(I/I_o): 3.773(1), 2.113(0.93), 3.846(0.4),2.71(0.35), 2.745(0.3), 3.884(0.3), 4.241(0.29), 2.801(0.27),

Physical Properties of Steropesite

Cleavage:

None

Color:

Pale lemon yellow.

Fracture:

Unknown - Minerals too small to observe fractures.

Habit:

Tabular - Form dimensions are thin in one direction.

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Steropesite

Gladstone-Dale:

CI calc= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1693,KC= 0.17
Ncalc = 1.97

Optical Data:

Biaxial (?), b=1.97

Calculated Properties of Steropesite

Electron Density:

Bulk Density (Electron Density)=4.73 gm/cc
note: Specific Gravity of Steropesite =5.73 gm/cc.

Fermion Index:

Fermion Index = 2.347618E-7
Boson Index = 0.9999997652

Photoelectric:

PE_Steropesite=1,439.77 barns/electron
U=PE_Steropesite x rElectron Density=6,811.66 barns/cc.

Radioactivity:

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

Steropesite Classification

Dana Class:

11.05.08.03 (11)Halide Complexes; Alumino-fluorides

(11.05)where (A)m B (X)6

(11.05.08)Challacolloite Group

11.05.08.01 Challacolloite! KPb2Cl5 P 2₁/c 2/m

11.05.08.02 Hephaistosite! TlPb2Cl5 P 2₁/c 2/m

11.05.08.03 Steropesite! Tl3BiCl6 Cc m

11.05.08.04 Panichiite! (NH4)2SnCl6 Fm3m 4 3m

Strunz Class:

03.C 03 - HALIDES

03.C - Complex Halides

03.C -

03.C Steropesite! Tl3BiCl6 Cc m

03.C IMA2008-032 CuCl2•2NH3 C mcm 2/m 2/m 2/m

03.C IMA2008-039 (NH4)3PbCl5 P nma 2/m 2/m 2/m

Other Steropesite Information

References:

NAME( CanMin, v47:373) PHYS. PROP.(CanMin, v47:373) OPTIC PROP.(CanMin, v47:373)

See Also:

Links to other databases for Steropesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Steropesite Specimen Label here :

Steropesite

Tl3BiCl6
Dana No: 11.05.08.03 Strunz No: 03.C
Locality:

Notes:

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