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Leogangite

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Formula:
Cu10(AsO4)4(SO4)(OH)6 · 8H2O
System:
Monoclinic
Colour:
green with a bluish tint
Name:
For the type locality in several mines at Schwarzleograben, Hütten, Leogang, Saalfelden, Salzburg, Austria.
Closely related to Unnamed (Leogangite-related mineral) with which it is easily confused.

Classification of Leogangite

Approved 1998
8.CC.15

8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
C : With only medium-sized cations, RO4:H2O = 1:1.5
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Type Occurrence of Leogangite

General Appearance of Type Material:
Aggregates of thin tabular crystals, flattened on {100} and elongated along [010], measuring up to 0.1 mm in length, 0.05 mm in width and 0.01 mm in thickness.
Geological Setting of Type Material:
Alteration product of arsenic-rich fahlore in vugs of a tennantite-bearing dolomite breccia, intergrown with olivenite and malachite.

Physical Properties of Leogangite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
green with a bluish tint
Streak:
light green
Cleavage:
Perfect
parallel to (100)
Density:
3.55 g/cm3 (Calculated)

Crystallography of Leogangite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 21.77Å, b = 12.327Å, c = 10.72Å
β = 92.85°
Ratio:
a:b:c = 1.766 : 1 : 0.87
Unit Cell Volume:
V 2873 ų
Z:
4
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.85 (100)
hkl = (200)
2.630 (60)
5.44 (50)
hkl = (400)
3.625 (50)
hkl = (600)
3.090 (40)
hkl = (023)

Optical Data of Leogangite

Type:
Biaxial (-)
RI values:
nω = 1.590 nε = 1.740 n = 1.744
2V:
Measured: 182°
Max Birefringence:
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Comments:
Blue-green to pale green.

Chemical Properties of Leogangite

Formula:
Cu10(AsO4)4(SO4)(OH)6 · 8H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Composition by microprobe analysis, average formula based on 20 +/- 3 oxygen atoms.
CuO (49.6 - 52.9)
As2O5 (28.5 - 31.1)
SO3 (4.9 - 5.4)
Empirical Formula:
Cu9.94[(OH)6|S0.99O4|(As0.99Si0.01O4)4] · 8.89 H2O
Common Impurities:
Si

Relationship of Leogangite to other Species

8.CC.05Garyansellite(Mg,Fe)3(PO4)2(OH,O) · 1.5H2O
8.CC.05Kryzhanovskite(Fe3+,Mn2+)3(PO4)2(OH,H2O)3
8.CC.05LandesiteMn2+3-xFex3+(PO4)2(OH)x · (3-x)H2O
8.CC.05Phosphoferrite(Fe2+,Mn2+)3(PO4)2 · 3H2O
8.CC.05Reddingite(Mn2+,Fe2+)3(PO4)2 · 3H2O
8.CC.10KaatialaiteFe(H2AsO4)3 · 5H2O

Other Names for Leogangite

Name in Other Languages:
German:Leogangit
Simplified Chinese:水羟硫砷铜石
Traditional Chinese:水羥硫砷銅石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Leogangite

Reference List:
Lengauer, C. L., Giester, G. and Kirchner, E. (1998): Cu10(AsO4)4(SO4)(OH)6.8H2O, ein neues Mineral aus Leogang, Österreich. Mitt. Österr. Mineral. Ges. 143, 325-327. (in German).

Lengauer, C. L.; Giester, G.; Kirchner, E. (2004): Leogangite, Cu10(AsO4)4(SO4)(OH)6.8H2O, a new mineral from the Leogang mining district, Salzburg province, Austria. Mineralogy and Petrology 81, 187-201.

Internet Links for Leogangite

Localities for Leogangite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Carinthia
    • Karawanken
      • Finkenstein
        • Mallestiger Mittagskogel
G.Indra
  • Salzburg
    • Saalfelden
      • Leogang
        • Hütten
          • Schwarzleograben
            • Inschlag Alp
C.L. Lengauer, G. Giester, E. Kirchner: Mineralogy and Petrology 81:187-201 (2004)
            • Schwarzleo District
C.L. Lengauer, G. Giester, E. Kirchner: Mineralogy and Petrology 81:187-201 (2004)
Poeverlein, R. (2008): Euchroit und seine Begleiter vom prähistorischen Bergbau, Leogang, Österreich. Lapis, 33 (5), 13-22.
            • Vogel Alp
Putz, H., Lechner, A., Poeverlein, R. (2005): Leogangit von der Vogelhalt bei Leogang, Salzburg. Lapis 30 (10), 53-55; 90; Brent Thorne collection
  • Tyrol
    • North Tyrol
      • Inn valley
        • Brixlegg - Schwaz area
          • Brixlegg - Rattenberg
            • Geyer - Silberberg District
              • Silberberg
                • West slope ("Am Geyer")
R. Poeverlein and J. Gröbner (2007): "Der Bergbau Geyer bei Rattenberg in Tirol und seine Mineralien", Lapis 32(2), 34-38.
Schnorrer, G. & Poeverlein, R. (2008): Schwaz-Brixlegger Fundstellen. 6. Die Minerale des Gratlspitz bei Brixlegg in Tirol. Aufschluss 59, 7-28.
C.Auer (2013)
            • St Gertraudi
              • Großkogel (Reither Kogel)
Putz, H. & Poeverlein, R. (2007): Die Mineralien des Gertraudstollens und seiner Halde in St. Gertraudi, Tirol. Lapis 32 (6), 58-63.
          • Schwaz
            • Ringenwechsel District
              • Weißer Schrofen
Schnorrer, G., Poeverlein, R. (2007): Die Minerale des Martinstollens am Weißen Schrofen, Der Aufschluss, Vol. 58, 27-40
        • Wörgl
          • Wildschönau
            • Thierbach
              • Graschberg
R. Poeverlein, J. Gröbner & U. Kolitsch (2010): Mineralien und Bergbau vom Graschberg bei Thierbach in der Tiroler Wildschönau. Lapis 35 (3), 35-40; 54 (in German).
Germany
 
  • North Rhine-Westphalia
    • Siegerland
      • Müsen
Schnorrer, G., Pfeiffer, F. (2008): Leogangit, Cu10[(OH)6|(AsO4)4|(SO4)]•8H2O, ein neues Mineral von der ehemaligen Grube Wildermann in Müsen im Siegerland. Der Aufschluss, 59, 405-408.
Spain
 
  • Catalonia
    • Girona (Gerona)
      • Ripollès
        • Camprodon
          • Rocabruna
Rosell, J. et al. (2014): UK-112: Leogangita de la mina de les Ferreres, Rocabruna, Camprodon, Girona, Catalunya. Infominer, 61 (3/2014).
Mineral and/or Locality  
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