Mineralogy Database

Crednerite Mineral Data

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General Crednerite Information

Help on Chemical  Formula: Chemical Formula: CuMnO2
Help on Composition: Composition: Molecular Weight = 150.48 gm
   Manganese  36.51 %  Mn   47.14 % MnO
   Copper     42.23 %  Cu   52.86 % CuO
   Oxygen     21.26 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuMn2+O2
Help on Environment: Environment: A low-temperature secondary mineral, perhaps indicating a reducing chemical environment.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1849
Help on Locality: Locality: Friedrichroda, in Thuringia and the Mendip Hills, Somerset, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Karl F. H. Credner (1809-1876), German mining geologist and mineralogist.
Help on Synonym: Synonym: ICSD 79115
  PDF 47-1816
 

Crednerite Image

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  Crednerite   Mendipite

Comments: Sooty, deep-black, granular to platy crednerite with mendipite.
Location: Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Chloroxiphite   Mendipite   Crednerite

Comments: Green, opaque granular chloroxiphite with mendipite and black crednerite.
Location: Higher Pitts Farm, Priddy, Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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  Mendipite   Crednerite   Chloroxiphite

Comments: Radiating compact with clear to white crystalline mendipite with black crednerite and green chloroxiphite.
Location: Mendip Hills, Somerset, England. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Crednerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.045:1:1.9174
Help on Cell Dimensions: Cell Dimensions: a = 5.898, b = 2.884, c = 5.53, Z = 2; beta = 104.6° V = 91.03 Den(Calc)= 5.49
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.42(1), 2.71(1), 2.85(0.8),
 

Physical Properties of Crednerite

Help on Cleavage: Cleavage: {001} Perfect, {100} Perfect, {111} Good
Help on Color: Color: Iron black, Steel gray.
Help on Density: Density: 4.9 - 5.1, Average = 5
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Pseudo Hexagonal - Crystals show a hexagonal outline.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Metallic
Help on Streak: Streak: brownish black
 

Optical Properties of Crednerite

Help on Optical Data: Optical Data: NCalc= 2 - from Gladstone-Dale relationship (KC = 0.1827) where Ncalc=Dcalc*KC+1
NCalc= 1.91 - from Gladstone-Dale relationship (KC = 0.1827) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong.
Help on RL Bireflectance: RL Bireflectance: Strong, pale yellow to brownish gray.
Help on RL Color: RL Color: Cream-white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Crednerite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   28.30   28.60 
   
 420 nm   27.40   30.10 
 440 nm   26.50   31.60 
 460 nm   25.80   32.90 
 480 nm   25.10   33.70 
 500 nm   24.50   34.00 
 520 nm   24.10   34.30 
 540 nm   23.80   34.20 
 560 nm   23.50   34.10 
 580 nm   23.30   33.70 
 600 nm   23.10   33.10 
 620 nm   22.90   32.60 
 640 nm   22.70   32.00 
 660 nm   22.50   31.20 
 680 nm   22.40   30.50 
 700 nm   22.20   29.90 
Calculated Relative Intensity Colors of Crednerite in Air
Relative
Intensity
   0%   40%   80% 100% 120% 160% 200% 240% 280% 320% 360% 380%
R1                        
R2                        
 

Calculated Properties of Crednerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Crednerite =5.49 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001020676
Boson Index = 0.9998979324
Help on Photoelectric: Photoelectric: PECrednerite = 28.78 barns/electron
U=PECrednerite x rElectron Density= 146.97 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crednerite is Not Radioactive
 

Crednerite Classification

Help on  Dana Class: Dana Class: 07.01.02.01 (07)Multiple Oxides
  (07.01)where A B X2 containing copper
  (07.01.02)Dana Group
 
07.01.02.01 Crednerite CuMnO2 A2/m 2/m
Help on  Strunz Class: Strunz Class: 04.AB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.A - Metal:Oxygen = 2.1 and 1:1
  04.AB -M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only
 
04.AB.05 Crednerite CuMnO2 A2/m 2/m
 

Other Crednerite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Crednerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Crednerite Specimen Label here :

Crednerite

CuMnO2
Dana No: 07.01.02.01 Strunz No: 04.AB.05
Locality:

 

Notes:

 

 
   
 


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