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Koechlinite

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Adam Heber Mine (Shaft 43), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany
© Thomas Witzke

Show Koechlinite Photos (4)
Formula:
(BiO)
 
2
[MoO
 
4
]
System:OrthorhombicColour:Greenish yellow, white ...
Name:After Rudolf Ignatz Koechlin (1862-1939), 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.

Classification of Koechlinite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:6/G.01-60
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:48.2.2.1

48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
2 : A2XO4
Hey's CIM Ref.:27.3.4

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

Type Locality:Daniel Mine, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany
Place of Conservation of Type Material:Harvard University, Cambridge, Massachusetts: #64801. U.S. National Museum of Natural History, Washington, D.C., USA: #R6411, 93646.
Year of Discovery:1914
Associated Minerals at type locality:
SkutteruditeQuartzBismuth

Physical Properties of Koechlinite

Lustre: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 (calculated):8.26 g/cm3

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
Maximum Birefringence:δ = 0.150

Chart 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:
(BiO)
 
2
[MoO
 
4
]
Essential elements:Bi, Mo, O
All elements listed in formula:Bi, Mo, O

Relationship of Koechlinite to other Species

Common Associates:
WulfeniteQuartzMolybdeniteBismuthiniteAikinite
Aikinite
Related Minerals - Nickel-Strunz Grouping):
4.DE.05Downeyite
SeO
 
2
4.DE.10Koragoite
(Mn
2+
 
,Fe
3+
 
)
 
3
(Nb,Ta,Ti)
 
2
(Nb,Mn)
 
2
(W,Ta)
 
2
O
 
20
4.DE.15Russellite
(BiO)
 
2
[WO
 
4
]
4.DE.15Tungstibite
Sb
 
2
WO
 
6
4.DE.20Tellurite
TeO
 
2
4.DE.25Paratellurite
TeO
 
2
4.DE.30Bismutotantalite
Bi(Ta,Nb)O
 
4
4.DE.30Bismutocolumbite
Bi(Nb,Ta)O
 
4
4.DE.30Cervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.30Stibiotantalite
Sb(Ta,Nb)O
 
4
4.DE.30Stibiocolumbite
Sb(Nb,Ta)O
 
4
4.DE.30Clinocervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.35Baddeleyite
ZrO
 
2
Related Minerals - Hey's Index Grouping:
27.3.1Lindgrenite
Cu
 
3
[OH|MoO
 
4
]
 
2
27.3.2Powellite
Ca[MoO
 
4
]
27.3.3Wulfenite
Pb[MoO
 
4
]
27.3.5Sedovite
U(MoO
 
4
)
 
2
27.3.6Mourite
UMo
 
5
O
 
12
(OH)
 
10
27.3.7Iriginite
UO
 
2
Mo
 
2
O
 
7
·3H
 
2
O
27.3.8Umohoite
(UO
 
2
)MoO
 
4
·4H
 
2
O
27.3.9Moluranite
U(UO
 
2
)
 
2
Mo
 
5
O
 
19
·12H
 
2
O ?
27.3.10Cousinite
MgU
 
2
Mo
 
2
O
 
11
·6H
 
2
O
27.3.11Calcurmolite
(Ca,Na)
 
2
(UO
 
2
)
 
3
Mo
 
2
(O,OH)
 
11
·nH
 
2
O
27.3.12Tengchongite
CaO·6UO
 
3
·2MoO
 
3
·12H
 
2
O
27.3.13Kamiokite
Fe
 
2
Mo
 
3
O
 
8
27.3.14Ferrimolybdite
Fe
 
2
[MoO
 
4
]
 
3
 · nH
 
2
O

Other Names for Koechlinite

German names:
Koechlinit
Russian names:
Кехлинит
Spanish names:
Koechlinita

Other Information

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

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

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    Localities for Koechlinite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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.
        • 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
      • Ballarat
        • Pittong
    		Australian Journal of Mineralogy: 7(2).
    • Western Australia
      • 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.
    China
     
    • Fujian Province
      • Ningde Prefecture
        • Fu'an Co.
    		http://www.minsocam.org/ammin/AM76/AM76_665.pdf
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • Ústí Region
        • Krušné Hory Mts (Erzgebirge)
    		Jiří Sejkora - Sekundární minerály Bismutu z povrchového výchozu
    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)
    Italy
     
    • Sardinia
      • Carbonia-Iglesias Province
        • Domusnovas
    		AA. VV., 1996. Collezionare minerali. Hobby & Work
    Japan
     
    • Honshu Island
      • Chubu Region
        • Gifu Prefecture
          • Ena-gun
            • Hirukawa
    		Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo
      • Kanto region
        • Tochigi Prefecture
          • Ashio
    		Ryoichi SADANAGA and Michiaki BUNNO (1974) THE WAKABAYASHI MINERAL COLLECTION Bulletin No. 7 The University Museum, The University of Tokyo
    South Africa
     
    • Mpumalanga Province
      • Eastern Bushveld Complex
        • Potgietersrus
    		Minerals of South Africa
      • Kromdraai 209 JR farm
    		S. Weinert (2006) Locality Data Sheet ML35 (South African Micromount Society)
    UK
     
    • England
      • Cumbria
        • South Eastern Region (Westmorland)
          • Eastern Fells
            • Shap
    		M.Wirth collection
    USA
     
    • Arizona
      • Gila Co.
        • Globe-Miami District
          • Inspiration
            • Miami-Inspiration deposit
    		Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 268.
    • California
      • Plumas Co.
        • Last Chance District
          • Spring Creek area
    		[MinRecord 29:165]
    Mineralogical Record (In press)
    • Colorado
      • Lake Co.
        • Climax District
          • Climax
    		Minerals of Colorado (1997) Eckels, E. B.
    • Nevada
      • Nye Co.
        • Round Mountain District
    		[MinRec 22:181]
    Mineral and/or Locality
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