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Crednerite

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Torr Works Quarry (Merehead Quarry), Cranmore, Somerset, England, UK
© Ian Jones

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Formula:
CuMnO
 
2
System:MonoclinicColour:Black
Hardness:4
Name:After C.F. Credner (1809-1876), 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
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)
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.

Optical Data of Crednerite

Type:Anisotropic

Chemical Properties of Crednerite

Formula:
CuMnO
 
2
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
CuCu
 
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
Lepidophäite
German names:
CredneritLepidophäitMangankupfererzMangankupferoxyd
Russian names:
Креднерит
Spanish names:
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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Crednerite in the Natural History Museum (London) online catalogue
  • Crednerite details from Handbook of Mineralogy (PDF)
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    Localities for Crednerite

    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.
    Germany
     
    • North Rhine-Westphalia
      • 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
    • Lombardy
      • Sondrio Province
        • Malenco Valley
    		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.
    Mexico
     
    • Baja California Sur
      • Mun. de Mulegé
        • Boleó District
    		[MinRec 29:43]
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
        • Tachgagalt (Tachguagalt)
    		FAVREAU G. & DIETRICH J.E. (2006) Tachgagalt (Maroc), Le Cahier des Micromonteurs, 93, 37-71. (in French)
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    		Mineralogical Record: 22: 421.
    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
    		GFF 113, 159
    Switzerland
     
    • Wallis (Valais)
      • Turtmann Valley
    		The Canadian Mineralogist Vol. 44, pp. 000 (2006) page 205
    UK
     
    • England
      • 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
        • Holwell
    		BMS Database
        • Priddy
    		[Clark, 1993 - "Hey's Mineral Index"] [MinRec 27:253]
        • Westbury on Trym
    		BMS Database
    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.
    		Dana 7:722
    • Michigan
      • Ontonagon Co.
        • Mass City
    		Mineralogy of Michigan (2004) Heinrich & Robinson
    • New Mexico
      • Grant Co.
    		Northrop, Minerals of New Mexico, 3rd rev. ed., 1996
          • 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
    		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
    Mineral and/or Locality
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