Vurroite Mineral Data

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General Vurroite Information

Chemical Formula:

Pb20Sn2(Bi,As)22S54Cl6

Composition:

Molecular Weight = 9,577.60 gm

Thallium 0.06 % Tl

Tin 1.61 % Sn

Bismuth 28.34 % Bi

Arsenic 8.39 % As

Lead 41.00 % Pb

Selenium 0.18 % Se

Sulfur 18.32 % S

Bromine 0.24 % Br

Chlorine 1.85 % Cl

______

100.00 %

Empirical Formula:

Pb_18.95Sn_1.3Bi_12.99As_10.73Tl_0.03S_54.71Se_0.22Cl₅Br_0.29

Environment:

Assemblage of Pb-Bi sulfosalts encrusting high temperature (400-600 °C) fumaroles. OD (order-disorder) structure F2/d11 and A2/d11.

IMA Status:

Approved IMA 2003 (Dana # Added)

Locality:

Rim and inner slope of the La Fossa crater of Vulcano Island, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Filippo Vurro, Professor of Mineralogy at the University of Bari and specialist in the mineralogy and geochemistry of modern volcanic deposits.

Synonym:

IMA2003-027

Vurroite Image

Images:

Vurroite

Comments: SEM image of a jack-straw aggregate of vurroite crystals. (CanMin, v43:703).
Location: Fumarole (400-600 deg C) Pb-Bi epithermal deposit of La Fossa crater, on Vulcano Island, Italy. Scale: See Image.
© Canadian Mineralogist

Vurroite Crystallography

Axial Ratios:

a:b:c =0.1839:1:0.5993

Cell Dimensions:

a = 8.371, b = 45.502, c = 27.273, Z = 4; beta = 98.83° V = 10,265.09 Den(Calc)= 6.20

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): 2.07(1)(18.2.8 ), 3.34(0.8)(822), 2.85(0.8)(16.0.2 ),2.69(0.8)(12.2.6 ), 2.1(0.7)(040), 3.17(0.6)(826), 2.17(0.6)(18.2.2 ), 2.04(0.5)(20.0.12), 3.71(0.45)(12.0.4 ),

Crystal Structure:

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Pinto D , Bonaccorsi E , Balic-Zunic T , Makovicky E , American Mineralogist , 93 (2008) p.713-727, The crystal structure of vurroite, Pb20Sn2(Bi,As)22S54Cl6: OD-character,, polytypism, twinning, and modular description, Locality: Vulcano, Aeolian Islands, Italy

Physical Properties of Vurroite

Cleavage:

Unknown

Color:

Silvery gray.

Diaphaneity:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Fibrous - Crystals made up of fibers.

Luster:

Metallic

Optical Properties of Vurroite

RL Anisotrophism:

Weak.

RL Bireflectance:

None.

RL Color:

White with no internal reflections.

RL Pleochroism:

None.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Vurroite in Air**
λ	R	∑ R(λ)
470 nm	34.25
546 nm	32.95
589 nm	32.60
650 nm	31.05

**Calculated Relative Intensity Colors of Vurroite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	280%
R

Calculated Properties of Vurroite

Electron Density:

Bulk Density (Electron Density)=5.22 gm/cc
note: Specific Gravity of Vurroite =6.20 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

PE_Vurroite=1,303.82 barns/electron
U=PE_Vurroite x rElectron Density=6,805.44 barns/cc.

Radioactivity:

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

Vurroite Classification

Dana Class:

03.06.23.01 (03)Sulfides - Sulfosalts

(03.06)where 2 < z/y < 2.49 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(03.06.23)Dana Group

03.06.23.01 Vurroite! Pb20Sn2(Bi,As)22S54Cl6 C 2/c 2/m

Strunz Class:

02.JB.65 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.J - Sulfosalts of PbS Archetype

02.JB -Galena derivatives, with Pb

02.JB.65 Vurroite! Pb20Sn2(Bi,As)22S54Cl6 C 2/c 2/m

Other Vurroite Information

References:

NAME( AmMin, v90, p1949) PHYS. PROP.(AmMin, v90,1949 - v93:713) OPTIC PROP.(AmMin, v90, p1949)

See Also:

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

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Vurroite

Pb20Sn2(Bi,As)22S54Cl6
Dana No: 03.06.23.01 Strunz No: 02.JB.65
Locality:

Notes: