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Crednerite Mineral Data
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General Crednerite Information
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 Chemical Formula: |
CuMnO2 |
| Composition: |
Molecular Weight = 150.48 gm |
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Manganese 36.51 % Mn 47.14 % MnO |
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Copper 42.23 % Cu 52.86 % CuO |
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Oxygen 21.26 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
CuMn2+O2 |
| Environment: |
A low-temperature secondary mineral, perhaps indicating a reducing chemical environment. |
| IMA Status: |
Valid Species (Pre-IMA) 1849 |
| Locality: |
Friedrichroda, in Thuringia and the Mendip Hills, Somerset, England. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Karl F. H. Credner (1809-1876), German mining geologist and mineralogist. |
| Synonym: |
ICSD 79115 |
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PDF 47-1816 |
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Crednerite Image |
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Images:
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Images:
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Images:
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Crednerite Crystallography
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| Axial Ratios: |
a:b:c =2.045:1:1.9174 |
| Cell Dimensions: |
a = 5.898, b = 2.884, c = 5.53, Z = 2; beta = 104.6° V = 91.03 Den(Calc)= 5.49 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.42(1), 2.71(1), 2.85(0.8), |
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Physical Properties of Crednerite
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| Cleavage: |
{001} Perfect, {100} Perfect, {111} Good |
| Color: |
Iron black, Steel gray. |
| Density: |
4.9 - 5.1, Average = 5 |
| Diaphaneity: |
Opaque |
| Habit: |
Platy - Sheet forms (e.g. micas). |
| Habit: |
Pseudo Hexagonal - Crystals show a hexagonal outline. |
| Hardness: |
4-5 - Fluorite-Apatite |
| Luster: |
Metallic |
| Streak: |
brownish black |
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Optical Properties of Crednerite
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| 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 |
| RL Anisotrophism: |
Strong. |
| RL Bireflectance: |
Strong, pale yellow to brownish gray. |
| RL Color: |
Cream-white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Crednerite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
28.30 |
28.60 |
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| 420 nm |
27.40 |
30.10 |
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| 440 nm |
26.50 |
31.60 |
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| 460 nm |
25.80 |
32.90 |
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| 480 nm |
25.10 |
33.70 |
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| 500 nm |
24.50 |
34.00 |
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| 520 nm |
24.10 |
34.30 |
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| 540 nm |
23.80 |
34.20 |
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| 560 nm |
23.50 |
34.10 |
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| 580 nm |
23.30 |
33.70 |
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| 600 nm |
23.10 |
33.10 |
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| 620 nm |
22.90 |
32.60 |
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| 640 nm |
22.70 |
32.00 |
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| 660 nm |
22.50 |
31.20 |
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| 680 nm |
22.40 |
30.50 |
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| 700 nm |
22.20 |
29.90 |
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Calculated Relative Intensity Colors of Crednerite in Air
Relative
Intensity |
0% |
40% |
80% |
100% |
120% |
160% |
200% |
240% |
280% |
320% |
360% |
380% |
| R1 |
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| R2 |
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Calculated Properties of Crednerite
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| Electron Density: |
Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Crednerite =5.49 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0001020676
Boson Index = 0.9998979324 |
| Photoelectric: |
PECrednerite = 28.78 barns/electron
U=PECrednerite x rElectron Density= 146.97 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crednerite is Not Radioactive |
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Crednerite Classification
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| Dana Class: |
07.01.02.01 (07)Multiple Oxides |
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(07.01)where A B X2 containing copper |
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(07.01.02)Dana Group |
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07.01.02.01 Crednerite CuMnO2 A2/m 2/m |
| Strunz Class: |
04.AB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.A - Metal:Oxygen = 2.1 and 1:1 |
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04.AB -M:O = 1:1 (and up to 1:1.25); with small to medium-sized cations only |
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04.AB.05 Crednerite CuMnO2 A2/m 2/m |
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Other Crednerite Information
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| References: |
NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| 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 :
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Crednerite
CuMnO2
Dana No: 07.01.02.01 Strunz No: 04.AB.05
Locality:
Notes:
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