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Koechlinite

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Formula:
Bi2MoO6
System:
Orthorhombic
Colour:
Greenish yellow, white ...
Name:
Named in 1914 by waldemar Theodore Schaller in honor of Rudolf Ignatz Koechlin [November 11, 1862 Wien, Austria - February 11, 1939 Wien, Austria], Austrian mineralogist and Curator of the mineral collection of the Vienna Natural History Museum (former Hof-Museum), Vienna, Austria.
A rare secondary mineral occurring in the oxidation zones of Bi-Mo deposits.

The molybate analogue of russellite.

Classification of Koechlinite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.DE.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
48.2.2.1

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
2 : A2XO4
27.3.4

27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
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First Recorded Occurrence of Koechlinite

Place of Conservation of First Recorded Material:
Harvard University, Cambridge, Massachusetts: #64801. U.S. National Museum of Natural History, Washington, D.C., USA: #R6411, 93646.
Year of Discovery:
1914

Physical Properties of Koechlinite

Silky
Diaphaneity (Transparency):
Transparent
Colour:
Greenish yellow, white to light gray; greenish yellow in transmitted light
Streak:
Pale greenish yellow
Tenacity:
Very brittle
Cleavage:
Perfect
On {010}, perfect on {0kl}, imperfect.
Density:
8.26 g/cm3 (Calculated)

Crystallography of Koechlinite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pna21
Cell Parameters:
a = 5.4822Å, b = 16.1986Å, c = 5.5091Å
Ratio:
a:b:c = 0.338 : 1 : 0.34
Unit Cell Volume:
V 489.23 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals thin, square to rectangular plates striated parallel [010] and laths flattened on {010}; spheroidal agrgegates of laths; massive or earthy incrustations.
Twinning:
{101} as twin plane, penetration and contact twins. Composition face {101} or {010} in contact twins.
Comment:
Pseudotetragonal; Space Group based on synthetic material.
Epitaxi Comments:
Parallel growths with an unidentified orthorhombic mineral reported.

Optical Data of Koechlinite

Type:
Biaxial (-)
RI values:
nα = 2.520 nβ = 2.610 nγ = 2.670
Max Birefringence:
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none
Pleochroism:
Weak
Comments:
In shades of greenish yellow.
Comments:
2V measured = large.

Chemical Properties of Koechlinite

Formula:
Bi2MoO6
Essential elements:
All elements listed in formula:

Relationship of Koechlinite to other Species

4.DE.05DowneyiteSeO2
4.DE.10Koragoite(Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20
4.DE.15RusselliteBi2WO6
4.DE.15TungstibiteSb23+WO6
4.DE.20TelluriteTeO2
4.DE.25ParatelluriteTeO2
4.DE.30BismutotantaliteBi(Ta,Nb)O4
4.DE.30BismutocolumbiteBi(Nb,Ta)O4
4.DE.30CervantiteSb3+Sb5+O4
4.DE.30StibiotantaliteSb(Ta,Nb)O4
4.DE.30StibiocolumbiteSb(Nb,Ta)O4
4.DE.30ClinocervantiteSb3+Sb5+O4
4.DE.35BaddeleyiteZrO2
27.3.1LindgreniteCu3(MoO4)2(OH)2
27.3.2PowelliteCa(MoO4)
27.3.3WulfenitePb(MoO4)
27.3.5SedoviteU(MoO4)2
27.3.6MouriteUMo5O12(OH)10
27.3.7Iriginite(UO2)Mo2O7 · 3H2O
27.3.8Umohoite(UO2)MoO4 · 2H2O
27.3.9MoluraniteH4U4+(UO2)3(MoO4)7 · 18H2O
27.3.10CousiniteMgU2Mo2O11 · 6H2O
27.3.11Calcurmolite(Ca,Na)2(UO2)3Mo2(O,OH)11 · nH2O
27.3.12TengchongiteCaO · 6UO3 · 2MoO3 · 12H2O
27.3.13KamiokiteFe2Mo3O8
27.3.14FerrimolybditeFe2(MoO4)3 · nH2O

Other Names for Koechlinite

Name in Other Languages:
German:Koechlinit
Simplified Chinese:钼铋矿
Spanish:Koechlinita
Traditional Chinese:鉬鉍礦

Other Information

Other Information:
Readily soluble in HCl, less so in HNO3.
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 Koechlinite

Reference List:
Schaller (1916) U.S. Geological Survey Bulletin 610: 10.

Larsen, E.S. and Berman, H. (1934) The Microscopic Determination of the Nonopaque Minerals, Second edition, USGS Bulletin 848: 212.

Frondel, C. (1943) New data on agricolite, koechlinite, and the bismuth arsenates. American Mineralogist, 28, 536–540.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1092-1093.

Zemann, J. (1956): Die Kristallstruktur von Koechlinit, Bi2MoO6. Contributions to Mineralogy and Petrology 5(2), 139-145 (in German).

Yushkin, N.P. (1969) The first find of koechlinite in the USSR. Doklady Acad. Nauk SSSR, 189, 852–855 (in Russian).

Teller, R.G., J.F. Brazdil, R.K. Grasselli, and J.D. Jorgensen (1984) The structure of bismuth molybdate,
Bi2MoO6, by powder neutron diffraction. Acta Crystallographica (1984): C40: 2001-2005.

Acta Crystallographica: B29: 2436-2438.

Internet Links for Koechlinite

Localities for Koechlinite

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.
Australia
 
  • New South Wales
    • Bourke Co.
      • Ardlethan
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1093.
    • Gough Co.
      • Elsmore
Rankin, J., Lawrence, L. J., Sharpe, J. L. and Williams, P. A. (2002): Rare secondary bismuth, tungsten and molybdenum minerals from Elsmore, New England district of New South Wales. Austral. J. Mineral. 8, 55-60.; Rankin, J., Lawrence, L. J., Sharpe, J. L. and Williams, P. A. (2002): Rare secondary bismuth, tungsten and molybdenum minerals from Elsmore, New England district of New South Wales. Austral. J. Mineral. 8, 55-60.
      • Kingsgate
Sharpe, J.L., & Williams P.A. (2004) - Secondary bismuth and molybdenum minerals from Kingsgate, New England district of New South Wales.- Australian Journal of Mineralogy, vol.10, n°1.
  • Victoria
    • Pittong
W.D.Birch 2001. A note on koechlinitr from Pittong, Victoria. Australian Journal of Mineralogy: 7(2), pp. 77-79
    • Thologolong
Museum Victoria Mineralogy Collection
  • Western Australia
    • Coolgardie Shire
      • Coolgardie
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1093.
    • Cue Shire
      • Poona
Hodge, L.C.(1970): Russellite- a second occurrence, Mineralogical Magazine, 1970: 37: 705-707
China
 
  • Fujian Province
    • Ningde Prefecture
      • Fu'an Co.
http://www.minsocam.org/ammin/AM76/AM76_665.pdf
Czech Republic
 
  • Bohemia (Böhmen; Boehmen)
    • Karlovy Vary Region
      • Horní Slavkov (Schlaggenwald)
        • Krásno (Schönfeld)
          • Vysoký Kámen
Sejkora, J., Ondruš, P., Fikar, M., Veselovský, F., Mach, Z. & Gabašová, A. (2006): New data on mineralogy of the Vysoký Kámen deposits near Krásno, Slavkovský les area, Czech Republic. Journal of the Czech Geological Society 51, 43-55.
    • Ústí Region
      • Krušné Hory Mts (Erzgebirge)
Jiří Sejkora - Sekundární minerály Bismutu z povrchového výchozu
          • Knöttel area (Knötel; Knödel; Knödlberg)
J.Sejkora, M.Kotrly - Sekundární minerály Bismutu z povrvhového výchozu křemenného pně. 1998
Germany
 
  • Baden-Württemberg
    • Black Forest
      • Wolfach
        • Oberwolfach
          • Rankach valley
Walenta, K. (1992): Die Mineralien des Schwarzwaldes. Chr. Weise Verlag, München, 336 pp. (in German); WALENTA, K. (1993): Neue Mineralfunde von der Grube Clara (5. Folge). - Lapis 18 (1), 16-23.
  • Saxony
    • Erzgebirge
      • Schneeberg District
        • Neustädtel
Journal of the Washington Academy of Science (1914): 4, 354-356; Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1093; Wittern: "Mineralfundorte in Deutschland", 2001
Lapis 30(7/8):41-70 (2005)
    • Oberlausitz
      • Görlitz
        • Königshain
Witzke, T. & Giesler, T. (2007): Wismut-Mineralien aus dem Königshainer Granit, Lausitz.- Mineralien-Welt 18(4), 14-19
        • Thiemendorf
Witzke, T. & Giesler, T. (2007): Wismut-Mineralien aus dem Königshainer Granit, Lausitz.- Mineralien-Welt 18(4), 14-19
Italy
 
  • Sardinia
    • Cagliari Province
      • Sarroch
Orlandi, P., Demartin, F., Pasero, M., Leveret,P., William, P.A., Hibbs,D.E., (2011), Gelosaite BiMo6+(2–5x)Mo5+6xO7(OH)·H2O (0 ≤ x ≤ 0.4), a new mineral from Su Senargiu (CA), Sardinia, Italy, and a second occurrence from Kingsgate, New England, Australia. Am. Min.: 96: 268 - 273.
Orlandi, P. & Campostrini, I. (2005): Zibaldone. Aggiornamenti di mineralogia italiana 2004. Rivista Mineralogica Italiana, 3/2005, 184-191.
    • Carbonia-Iglesias Province
      • Domusnovas
        • Oridda
AA. VV., 1996. Collezionare minerali. Hobby & Work
Japan
 
  • Honshu Island
    • Chubu Region
      • Gifu Prefecture
        • Nakatsugawa City
          • Hirukawa
Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo; 浜地忠男, & 谷正巳. (1961). 岐阜県苗木地方ウラン調査報告. 纐纈山および西大洞地区の砂鉱. 地調月報, 11, 34-40.
    • Kanto region
      • Tochigi Prefecture
        • Nikko City
          • Ashio-machi
Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo
Kazakhstan
 
  • Karagandy Province (Qaragandy Oblysy; Karaganda Oblast')
    • Betpakdala Desert (Bet-Pak-Dal Desert)
Jeremolenko, V. (2002): Kara-Oba: Mineralogische Perle der Betpak-Ebene bei Dzhambul, Kasachstan. Lapis 27 (4), 13-34 + 50
Mexico
 
  • Sonora
    • Mun. de Imuris
dan weinrich
South Africa
 
  • Gauteng Province
    • Pretoria District (Tshwane District)
S. Weinert (2006) Locality Data Sheet ML35 (South African Micromount Society); Rocks & Minerals 83:5 pp 410-421
  • Limpopo Province
    • Bushveld Complex
      • Waterberg District
        • Mokopane (Potgietersrus)
Minerals of South Africa
Spain
 
  • Extremadura
    • Badajoz
      • Valle de la Serena
Calvo, M. (2009). Minerales y Minas de España. Vol. IV, Óxidos e Hidróxidos. Escuela Técnica Superior de Ingenieros de Minas de Madrid - Fundación Gómez Pardo. 752 pp.
UK
 
  • England
    • Cumbria
      • South Eastern Region (Westmorland)
        • Eastern Fells
          • Shap
M.Wirth collection
USA
 
  • Arizona
    • Gila Co.
      • Globe-Miami District
        • Miami-Inspiration District
          • Inspiration
            • Miami-Inspiration deposit
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 268.
  • California
    • Plumas Co.
      • Diamond Mts
        • Last Chance District
          • Adams Peak
Mineralogical Record (1998): 29: 165.
Dunning, G.E., Cooper, J.F. (2005) Mineralogy of the Spring Creek area, Last Chance mining district, Plumas County, California. Axis: 1: 1-30.
  • Colorado
    • Lake Co.
      • Climax District
        • Climax
Minerals of Colorado (1997) Eckels, E. B.
  • Nevada
    • Nye Co.
      • Toquima Range
        • Round Mountain District
[MinRec 22:181]
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