Leogangite Mineral Data

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General Leogangite Information

Chemical Formula:

Cu10(AsO4)4(SO4)(OH)6•8(H2O)

Composition:

Molecular Weight = 1,543.39 gm

Copper 40.93 % Cu 51.23 % CuO

Silicon 0.07 % Si 0.16 % SiO₂

Arsenic 19.22 % As 29.49 % As₂O₅

Hydrogen 1.55 % H 13.88 % H₂O

Sulfur 2.06 % S 4.62 % S₂O₅

Oxygen 36.17 % O

______ ______

100.00 % 99.37 % = TOTAL OXIDE

Empirical Formula:

Cu_9.94As_3.96Si_0.04O₁₆S_0.99O₄(OH)₆•8.89(H₂O)

Environment:

In ore-bearing dolomite breccia.

IMA Status:

Approved IMA 2004 (Dana # Added)

Locality:

A mine dump of the Danielstollen, in the Schwarzleo valley about 10 km west-southwest of Leogang, Salzburg, Austria. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA1998-032

Leogangite Image

Images:

Leogangite

Comments: Cotype sample of leogangite (A. Strasser) showing the thin tabular habit parallel to (100). (Mineralogy and Petrology, 81:190).
Location: Mine dumps of the Danielstollen and Inschlagalm in the Schwarzleo valley, both part of the polymetallic ore district of Leogang, Salzburg province, Austria. Scale: See Image.
© Mineralogy and Petrology

Leogangite Crystallography

Axial Ratios:

a:b:c =1.766:1:0.8696

Cell Dimensions:

a = 21.77, b = 12.327, c = 10.72, Z = 4; beta = 92.85° V = 2,873.25 Den(Calc)= 3.57

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): 10.85(1)(200), 2.63(0.6)(513,204), 3.625(0.5)(600), 5.44(0.5)(400), 2.672(0.4)(042), 3.09(0.4)(023), 1.618(0.3)(155), 3.728(0.3)(402), 4.9(0.3)(202),

Crystal Structure:

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drag2 - RMB Resize/Rotate
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Lengauer C L , Giester G , Kirchner E , Mineralogy and Petrology , 81 (2004) p.187-201, Leogangite, Cu10(AsO4)4(SO4)(OH)6·8H2O, a new mineral from the Leogang mining, district, Salzburg province, Austria, Locality: Leogang polymetallic ore district, Salzburg province, Austria

Physical Properties of Leogangite

Cleavage:

{100} Perfect

Color:

Green, Bluish green.

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Leogangite

Gladstone-Dale:

CI calc= -0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1937,KC= 0.1824
Ncalc = 1.65

Optical Data:

Biaxial (-), a=1.59, b=1.74, g=1.744, bire=0.1540, 2V(Calc)=16, 2V(Meas)=18. Dispersion r > v weak.

Calculated Properties of Leogangite

Electron Density:

Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Leogangite =3.57 gm/cc.

Fermion Index:

Fermion Index = 0.0003641938
Boson Index = 0.9996358062

Photoelectric:

PE_Leogangite= 31.20 barns/electron
U=PE_Leogangite x rElectron Density= 106.56 barns/cc.

Radioactivity:

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

Leogangite Classification

Dana Class:

43.05.23.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.23)Dana Group

43.05.23.01 Leogangite! Cu10(AsO4)4(SO4)(OH)6•8(H2O) C 2/c 2/m

Strunz Class:

08.CC.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CC -With only medium-sized cations, RO4:H2O = 1:1.5

08.CC.15 Leogangite! Cu10(AsO4)4(SO4)(OH)6•8(H2O) C 2/c 2/m

Other Leogangite Information

References:

NAME( CanMin, 42:1912) PHYS. PROP.(MinPet, 81:187) OPTIC PROP.(CanMin, 42:1912)

See Also:

Links to other databases for Leogangite :
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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Print or Cut-and-Paste your Leogangite Specimen Label here :

Leogangite

Cu10(AsO4)4(SO4)(OH)6•8(H2O)
Dana No: 43.05.23.01 Strunz No: 08.CC.15
Locality:

Notes: