Leogangite Mineral Data
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 % As2 O5
Hydrogen 1.55 % H 13.88 % H2 O
Sulfur 2.06 % S 4.62 % S2 O5
Oxygen 36.17 % O
______ ______
100.00 % 99.37 % = TOTAL OXIDE
Empirical Formula:
Cu9.94 As3.96 Si0.04 O16 S0.99 O4 (OH)6 •8.89(H2 O)
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 - Prismatic H-M Symbol (2/m) Space Group: C 2/c
X Ray Diffraction:
By Intensity(I/Io ): 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.
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:
PELeogangite = 31.20 barns/electronU=PELeogangite x r Electron 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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Leogangite
Cu10(AsO4)4(SO4)(OH)6•8(H2O)
Dana No: 43.05.23.01 Strunz No: 08.CC.15
Locality:
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