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Crednerite

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Formula:
CuMnO2
System:
Monoclinic
Colour:
Bright gray to iron black
Hardness:
4
Name:
After Karl Friedrich Heinrich Credner (13 March 1809 – 28 September 1876), German mining geologist and mineralogist who discovered the mineral.
This page provides mineralogical data about Crednerite.

Classification of Crednerite

Approved, 'Grandfathered' (first described prior to 1959)
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
7.1.2.1

7 : MULTIPLE OXIDES
1 : ABX2
7.3.5

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

Occurrences of Crednerite

Geological Setting:
low-temperature secondary mineral

Physical Properties of Crednerite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Bright gray to iron black
Streak:
Brownish-black
Hardness (Mohs):
4
Hardness (Vickers):
VHN100=231 - 297 kg/mm2
Tenacity:
Brittle
Cleavage:
Perfect
In the plane of the plate; along the striae and inclined about 76° to the plate - less perfect.
perfect {001}; also {100}, perfect, {111}, prominent, {111} and {212}, poor.
Density:
4.98 - 5.34 g/cm3 (Measured)    5.46 g/cm3 (Calculated)

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.
Comment:
on synthetic material
X-Ray Powder Diffraction Data:
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
Anisotropism:
strong
Bireflectance:
Strong; pale yellow to brownish gray
Colour in reflected light:
cream white

Chemical Properties of Crednerite

Formula:
CuMnO2
All elements listed in formula:

Relationship of Crednerite to other Species

4.AB.Carbon Monoxide IceCO
4.AB.10TenoriteCuO
4.AB.15DelafossiteCuFeO2
4.AB.15McconnelliteCuCrO2
4.AB.20BromelliteBeO
4.AB.20ZinciteZnO
4.AB.25BunseniteNiO
4.AB.25LimeCaO
4.AB.25ManganositeMnO
4.AB.25MonteponiteCdO
4.AB.25PericlaseMgO
4.AB.25WüstiteFeO
4.AB.30PalladinitePdO
7.3.1CupriteCu2O
7.3.2TenoriteCuO
7.3.3ParamelaconiteCu2Cu2O3
7.3.4SpertiniiteCu(OH)2
7.3.6DelafossiteCuFeO2
7.3.7CuprospinelCu2+Fe23+O4

Other Names for Crednerite

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 Crednerite

Reference List:
Credner (1847), Jb. Min.: 5 (as Kupferhaltige Manganerz).

Hausmann (1847): 1582 (as Mangankupferoxyd)

Rammelsberg C (1849) Ueber das mangankupfererz von Friedrichsrode, Zusatz zu der vorhergehenden abhandlung. Annalen der Physik und Chemie 74, 559-562

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

Wherry E T (1924) Redefinition of species. American Mineralogist 9, 97-98

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

Specimens:
The following Crednerite specimens are currently listed for sale on minfind.com.

Localities for Crednerite

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.
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 City
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
Serbia
 
  • Zaječar District
    • Bor area
Pačevski, A., Cvetković, V., Šarić, K.,Banješević, M., Hoefer, H.E., Kremenović, A. (2016): Manganese mineralization in andesites of Brestovačka Banja, Serbia: evidence of sea-floor exhalations in the Timok Magmatic Complex. Mineralogy and Petrology: 110: 491-502; http://forum.amiminerals.it/viewtopic.php?f=5&t=12922&sid=9b89d03bd5ce87f39ba8564967753056 (2016)
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 district
        • Jakobsberg ore field
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. Mineralogical Magazine 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
Mineral and/or Locality  
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