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Crednerite

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Formula:
CuMnO
 
2
System:MonoclinicColour:Black
Hardness:4
Name:After Karl F. H. Credner (1809-1876), German mining geologist and mineralogist.
This page provides mineralogical data about Crednerite.

Classification of Crednerite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/A.05-50
Nickel-Strunz 10th (pending) edition ID:4.AB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
A : Metal: Oxygen = 2:1 and 1:1
B : M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only
Dana 8th edition ID:7.1.2.1

7 : MULTIPLE OXIDES
1 : ABX2
Hey's CIM Ref.:7.3.5

7 : Oxides and Hydroxides
3 : Oxides of Cu
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Type Occurrence of Crednerite

Type Locality:Glücksstern Mine, Gottlob Hill, Friedrichroda, Thuringian Forest, Thuringia, Germany
Year of Discovery:1847

Physical Properties of Crednerite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Black
Streak:Brownish-black
Hardness (Mohs):4
Cleavage:Perfect
In the plane of the plate; along the striae and inclined about 76° to the plate - less perfect.
Density (measured):4.99 - 5.03 g/cm3

Crystallography of Crednerite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m
Space Group Setting:C1 2/m 1
Cell Parameters:a = 5.58Å, b = 2.87Å, c = 5.87Å
β = 104°
Ratio:a:b:c = 1.944 : 1 : 2.045
Unit Cell Volume:V 91.21 ų (Calculated from Unit Cell)
Z:2
Morphology:Occurs in thin six-sided plates; radiating, hemispherical or spherulitic aggregates. Earthy coatings.
Twinning:Three-fold set of striae intersecting on the plate at about 60° may represent twin lamellae. Polysynthetic twinning noted in polished sections at times.
X-Ray Powder Diffraction:
d-spacingIntensity
2.85 (6)
2.71 (10)
2.43 (10)
2.24 (5b)
1.764 (3)
1.613 (4)
1.560 (4)

Optical Data of Crednerite

Type:Anisotropic

Chemical Properties of Crednerite

Formula:
CuMnO
 
2
Simplified for copy/paste:CuMnO2
Essential elements:Cu, Mn, O
All elements listed in formula:Cu, Mn, O

Relationship of Crednerite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.AB.10Tenorite
CuO
4.AB.15Delafossite
CuFeO
 
2
4.AB.15Mcconnellite
CuCrO
 
2
4.AB.20Bromellite
BeO
4.AB.20Zincite
(Zn,Mn
2+
 
,Fe
2+
 
)O
4.AB.25Bunsenite
NiO
4.AB.25Lime
CaO
4.AB.25Manganosite
MnO
4.AB.25Monteponite
CdO
4.AB.25Periclase
MgO
4.AB.25Wüstite
FeO
4.AB.30Palladinite
PdO
Related Minerals - Hey's Index Grouping:

- +
7.3.1Cuprite
Cu
 
2
O
7.3.2Tenorite
CuO
7.3.3Paramelaconite
Cu
 
2
Cu
 
2
O
 
3
7.3.4Spertiniite
Cu(OH)
 
2
7.3.6Delafossite
CuFeO
 
2
7.3.7Cuprospinel
Cu
2+
 
Fe
3+
2
O
 
4

Other Names for Crednerite

Synonyms:
Copper-manganeseKupferhaltige manganerzKupferhaltiges manganerzKupfermanganKupfermanganerz
KupfermanganschwärzeLepidophäite
Other Languages:
German:Crednerit
Lepidophäit
Mangankupfererz
Mangankupferoxyd
Russian:Креднерит
Spanish:Crednerita

Other Information

Fluorescence in UV light:None
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 Crednerite

Reference List:

- +
Credner (1847), Jb. Min.: 5 (as Kupferhaltige Manganerz).

Hausmann (1847): 1582 (as Mangankupferoxyd)

Rammelsberg (1849), Ann. Phys.: 74: 559.

Spencer and Mountain (1923), Mineralogical Magazine: 20: 87.

Orcel and Pavlovitch (1932), Bull. soc. min.: 54: 108.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 722-723.

Töpfer, J., Trari, M., Gravereau, P., Chaminade, J.P., and Coumerc, J.P. (1995) Crystal growth and reinvestigation of the crystal structure of crednerite, CuMnO2. Zeitschrift für Kristallographie: 210: 184-187.

Internet Links for Crednerite

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Crednerite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Crednerite specimens are currently listed for sale on minfind.com.

    Localities for Crednerite

    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.
    (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.
    Germany
     
    • North Rhine-Westphalia
      • Bergisches Land
        • Engelskirchen
          • Loope
    Habel, B. & Linder, R. (2009): Die Grube "Castor" bei Loope und ihre Mineralien. Mineralien-Welt 20 (3), 10-23
      • Niederberg area
        • Wülfrath
          • Rohdenhaus
    Heckman H, Brandstätter F, Der Kalksteinbruch Rohdenhaus bei Wülfrath und seine Mineralien. Mineralien Welt 6/2005
      • Siegerland
        • Müsen
    Der Aufschluss 2000(2), 71-123
    • Thuringia
      • Thuringian Forest
        • Friedrichroda
          • Gottlob Hill
    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: 817; Mineralogical Journal 17 (1994), 21; Clark, 1993 - "Hey's Mineral Index".
    Italy
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
    [MinRec 32:356]
            • Reppia
    Palenzona A. (1987) - La Crednerite di Gambatesa (Val Graveglia) - Rivista Min. Italiana, Milano, fasc. 2, pp. 80-81
      • La Spezia Province
        • Rocchetta Vara
    EDX probed by AMI-SIUK. March/08/2013
    • Lombardy
      • Sondrio Province
        • Valtellina
          • Malenco Valley
            • Torre di Santa Maria
    AA. VV., 1996. Collezionare minerali. Hobby & Work.
          • Masino Valley
    AA. VV., 1996. Collezionare minerali. Hobby & Work.
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Fukushima Prefecture
          • Iwaki
    Matsubara, S., Miyawaki, R., Kato, A., Matsuyama, F., Mouri, T. and Suzuki, Y. (2001): Arseniopleite from the Gozaisho mine, Fukushima Prefecture, Japan. Bull. Natn. Sci. Mus., Tokyo, Ser. C, 27, 51-62. ; Mineralogical Journal Vol. 18 (1996) , No. 4 pp 155-160
    Mexico
     
    • Baja California Sur (BC Sur)
      • Mun. de Mulegé
        • Boleo District
    [MinRec 29:43]; Copper Handbook 1911
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
    FAVREAU G. & DIETRICH J.E. (2006) Tachgagalt (Maroc), Le Cahier des Micromonteurs, 93, 37-71. (in French)
    • Tadla-Azilal Region
      • Azilal Province
    Gaudefroy, C., Dietrich, J., Permingeat, F., and Picot, P. (1966): Bull. Soc. Franc Mineral. 89, 80-88
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425. American Mineralogist, Volume 73, pages 888-893, 1988
    Romania
     
    • Suceava Co.
      • Suceava district
        • Iacobeni (Jakobeny; Jacobeny; Jakabfalva)
    http://minerals-of-the-carpathians.eu
    Spain
     
    • Catalonia
      • Girona (Gerona)
        • Ripollès
          • Camprodon
            • Rocabruna
    Joan Rosell
    Sweden
     
    • Värmland
      • Filipstad
    Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183.
        • Nordmark (Nordmarksberg)
    GFF 113, 159
    Switzerland
     
    • Wallis (Valais)
      • Turtmann Valley
        • Pipjitälli
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): Mineralienlexikon der Schweiz. Wepf (Basel), p. 124.; Ansermet, S. (2012): Mines et minéraux du Valais - II. Anniviers et Tourtemagne. With contributions by N. Meisser, Ed. Porte-plumes (Ayer)
    UK
     
    • England
      • Bristol
        • Westbury on Trym
    BMS Database
      • Somerset
        • Cranmore
    Turner, R.W. (2005) A note on Crednerite from Merehead Quarry. Russell Soc Newsletter, No. 47, September 2005; Turner, R.W., (2006) A Mechanism for the formation of the Mineralised Mn Deposits at Merehead Quarry, Cranmore, Somerset, England. Min. Mag. vol. 70, no. 6, pp 629 - 653; Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46.
        • Holwell
    BMS Database
        • Mendip Hills
          • Priddy
    [Clark, 1993 - "Hey's Mineral Index"] [MinRec 27:253]
    USA
     
    • Arizona
      • Cochise Co.
        • Dragoon Mts
          • Turquoise District (Courtland-Gleeson District)
    R.O. Meyer collection
        • Mule Mts
          • Warren District
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 192; Graeme, R. (1993), Bisbee revisited, Min.Rec.: 24: 421-436.
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 192; Graeme, R. (1993), Bisbee revisited, Min.Rec.: 24: 421-436
    • California
      • Napa Co.
        • Mayacmas Mts (Mayacamas Mts)
          • Calistoga District (Silverado District)
    Dana 7:722
    Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 162.
    • Michigan
      • Ontonagon Co.
        • Mass City
    Mineralogy of Michigan (2004) Heinrich & Robinson
    • New Mexico
      • Grant Co.
    Minerals of New Mexico 3rd ed.
          • Deadman Canyon-California Gulch-Whitewater Canyon Area
    NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico
          • Tyrone Area
    NMBMMR Bull 83 Mineral Deposits of Western Grant County, New Mexico
      • Santa Fe Co.
        • La Bajada District
    Northrop, Minerals of New Mexico, 3rd rev. ed., 1996
    • Pennsylvania
      • Lebanon Co.
        • Cornwall Borough (Cornwall)
    Lapham & Geyer, 1965. Mineral Collecting in Pennsylvania
    • Texas
      • Hudspeth Co.
        • Quitman Mts
    R&M 66:3 pp 196-224
    • Utah
      • Utah Co.
        • East Tintic Mts
    UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Washington
      • Clallam Co.
        • Lake Crescent
    Cannon, B. (1975): Minerals of Washington, p.79
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