Mallestigite Mineral Data

General Mallestigite Information

Chemical Formula:

Pb3Sb+++++(SO4)(AsO4)(OH)6•3(H2O)

Composition:

Molecular Weight = 1,135.63 gm

Antimony 10.18 % Sb 13.53 % Sb₂O₅

Arsenic 5.81 % As 8.91 % As₂O₅

Hydrogen 1.07 % H 9.53 % H₂O

Lead 55.83 % Pb 60.14 % PbO

Sulfur 3.16 % S 7.90 % SO₃

Oxygen 23.95 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb_3.06Sb_0.95(SO₄)_1.12(AsO₄)_0.88(OH)_5.99•3.01(H₂O)

Environment:

In narrow fractures of limstones formed from the weathering of galena and tetrahedrite. The antimony dominant analog of fleischerite.

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Dump of a Cu-Pp-Zn mine 1 km NW of Mallestiger Mittagskogel, Finkenstein, Villach, Kï¿½rnten, Austria Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

IMA1996-043

Mallestigite Image

Images:

Mallestigite

Comments: Colorless prismatic crystals of mallestigite.
Location: Mallestiger Mittagskogel, Finkenstein, Villach, Carinthia, Austria. Scale: Picture size 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Mallestigite Crystallography

Axial Ratios:

a:c = 1:1.24166

Cell Dimensions:

a = 8.938, c = 11.098, Z = 2; V = 767.81 Den(Calc)= 4.91

Crystal System:

Hexagonal - Trapezohedral H-M Symbol (6 2 2) Space Group: P 6₃

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

By Intensity(I/I_o): 3.655(1)(201), 3.481(0.8)(112), 2.675(0.62)(203),6.35(0.44)(101), 2.235(0.35)(220), 3.175(0.31)(202), 7.74(0.25)(100), 1.741(0.24)(224),

Physical Properties of Mallestigite

Cleavage:

None

Color:

Colorless.

Diaphaneity:

Transparent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

white

Optical Properties of Mallestigite

Gladstone-Dale:

CI calc= 0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.159,KC= 0.1615
Ncalc = 1.79

Optical Data:

Uniaxial (+), w=1.76, e=1.801, bire=0.0410.

Calculated Properties of Mallestigite

Electron Density:

Bulk Density (Electron Density)=4.27 gm/cc
note: Specific Gravity of Mallestigite =4.91 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Mallestigite=1,023.43 barns/electron
U=PE_Mallestigite x rElectron Density=4,374.78 barns/cc.

Radioactivity:

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

Mallestigite Classification

Dana Class:

31.07.06.04 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.07)where (A+ B++)2 (XO4) Zqï¿½x(H2O)

(31.07.06)Despujolsite Group

31.07.06.01 Despujolsite Ca3Mn(SO4)2(OH)6•3(H2O) P 62c 6 m2

31.07.06.02 Schaurteite Ca3Ge(SO4)2(OH)6•3(H2O) P 62c 6 m2

31.07.06.03 Fleischerite Pb3Ge(SO4)2(OH)6•3(H2O) P 6₃/mmc 6/m 2/m 2/m

31.07.06.04 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6•3(H2O) P 6₃ 6 2 2

Strunz Class:

07.DF.25 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.25 Despujolsite Ca3Mn(SO4)2(OH)6•3(H2O) P 62c 6 m2

07.DF.25 Fleischerite Pb3Ge(SO4)2(OH)6•3(H2O) P 6₃/mmc 6/m 2/m 2/m

07.DF.25 Mallestigite! Pb3Sb(SO4)(AsO4)(OH)6•3(H2O) P 6₃ 6 2 2

07.DF.25 Schaurteite Ca3Ge(SO4)2(OH)6•3(H2O) P 62c 6 m2

Other Mallestigite Information

References:

NAME( MinRec,35:357) PHYS. PROP.(CanMin, 41:1314) OPTIC PROP.(MinRec,35:357)

See Also:

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

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Mallestigite

Pb3Sb+++++(SO4)(AsO4)(OH)6•3(H2O)
Dana No: 31.07.06.04 Strunz No: 07.DF.25
Locality:

Notes:

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