Mallestigite Mineral Data

Mallestigite Mineral Data

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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, Kärnten, 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 - TrapezohedralH-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.

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Mallestigite

Electron Density:

r_electron=4.27 gm/cc
note: r_Mallestigite=4.91 gm/cc.

Fermion Index

Fermion Index = 0.12373
Boson Index = 0.87627

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mallestigite is Not Radioactive

Mallestigite Classification

Dana Class:

31.7.6.4 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.7)where (A+ B++)2 (XO4) Zq·x(H2O)

(31.7.6)Dana Group

31.7.6.1 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.2 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

31.7.6.3 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

31.7.6.4 Mallestigite ! Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

Strunz Class:

VI/D.11-40 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/D - Water-bearing sulfates with unfamiliar anions. cations of medium and very big size

VI/D.11 - Despujolsite - Fleischerite series

VI/D.11-10 Despujolsite Ca3Mn(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-20 Schaurteite Ca3Ge(SO4)2(OH)6·3(H2O) P 62c 6 m2

VI/D.11-30 Fleischerite Pb3Ge(SO4)2(OH)6·3(H2O) P 6₃/mmc 6/m 2/m 2/m

VI/D.11-40 Mallestigite Pb3Sb(SO4)(AsO4)(OH)6·3(H2O) P 6₃ 6 2 2

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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

Mallestigite

Pb3Sb+++++(SO4)(AsO4)(OH)6·3(H2O)
Dana No: 31.7.6.4 Strunz No: VI/D.11-40
Locality:

Notes: