Leogangite Mineral Data

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),

Physical Properties of Leogangite

Cleavage:

[100] Perfect

Color:

Green, Bluish green.

Diaphaniety:

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= -0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1987,KC= 0.1824

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:

r_electron=3.33 gm/cc
note: r_Leogangite=3.48 gm/cc.

Fermion Index

Fermion Index = 0.00036
Boson Index = 0.99964

Photoelectric:

PE_Leogangite= 31.20 barns/electron
U=PE_Leogangite x r_electron= 103.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Leogangite is Not Radioactive

Leogangite Classification

Dana Class:

43.5.23.1 (43)Compound Phosphates, etc.

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

(43.5.23)Dana Group

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

Strunz Class:

VII/D.20-35 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.20 - Zapatalite - Chalcophyllite series

VII/D.20-10 Zapatalite Cu3Al4(PO4)3(OH)9·4(H2O) Unk Tetra

VII/D.20-20 Ceruleite Cu2Al7(AsO4)4(OH)13·12(H2O) P1 1

VII/D.20-30 Parnauite Cu9(AsO4)2(SO4)(OH)10·7(H2O) P 2₁22 2 2 2

VII/D.20-35 Leogangite Cu10(AsO4)4(SO4)(OH)6·8(H2O) C 2/c 2/m

VII/D.20-40 Liroconite Cu2Al(AsO4)(OH)4·4(H2O) I2/a 2/m

VII/D.20-50 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O) R 3m 3 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: 43.5.23.1 Strunz No: VII/D.20-35
Locality:

Notes: