Crednerite Mineral Data

General Crednerite Information

Chemical Formula:

CuMnO2

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

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

PDF 47-1816

Crednerite Image

Images:

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

Images:

Crednerite Chloroxiphite Mendipite

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

Images:

Crednerite Mendipite 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

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 - PrismaticH-M Symbol (2/m) Space Group: A2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.42(1), 2.71(1), 2.85(0.8),

Crystal Structure:

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Kondrashev I D , Soviet Physics Crystallography , 3 (1959) p.703-706, The crystal structure and composition of crednerite, CuMnO2, Locality: synthetic, Note: calculated bond lengths unreconcileable with reported

Physical Properties of Crednerite

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

Optical Properties of Crednerite

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	∑ 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

Electron Density:

Bulk Density (Electron Density)=5.11 gm/cc
note: Specific Gravity of Crednerite =5.49 gm/cc.

Fermion Index:

Fermion Index = 0.0001020676
Boson Index = 0.9998979324

Photoelectric:

PE_Crednerite= 28.78 barns/electron
U=PE_Crednerite x rElectron Density= 146.97 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Crednerite is Not Radioactive

Crednerite Classification

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

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

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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Ask about Crednerite here :
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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: