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Wernerkrauseite

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About WernerkrauseiteHide

Werner Krause
Formula:
Ca(Fe3+,Mn3+)2Mn4+O6
Colour:
Black
Lustre:
Sub-Metallic
Specific Gravity:
4.66 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Dr. Werner Krause (b. 1949), a research chemist in the chemical industry who has described several new secondary minerals.
Isostructural with:
Ca-deficient structural analogue of harmunite. Post-spinel structure type.
Crystallisation of wernerkrauseite took place at temperatures below 850–900°C under high oxygen fugacity.


Classification of WernerkrauseiteHide

Approved
Approval Year:
2014

Physical Properties of WernerkrauseiteHide

Sub-Metallic
Transparency:
Opaque
Comment:
Strong submetallic lustre
Colour:
Black
Streak:
Black
Hardness:
VHN25=154(5) kg/mm2 - Vickers
Density:
4.66 g/cm3 (Calculated)

Optical Data of WernerkrauseiteHide

Type:
Anisotropic
Anisotropism:
weak
Bireflectance:
weak
Reflectivity:
400nmR=31%
700nmR=19%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 31%.
Colour in reflected light:
gray
Pleochroism:
Weak
Comments:
very weak

Chemical Properties of WernerkrauseiteHide

Formula:
Ca(Fe3+,Mn3+)2Mn4+O6
IMA Formula:
CaFe3+2Mn4+O6

Crystallography of WernerkrauseiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Setting:
Pnma
Cell Parameters:
a = 9.0548(2) Å, b = 2.8718(1) Å, c = 10.9908(2) Å
Ratio:
a:b:c = 3.153 : 1 : 3.827
Unit Cell V:
285.8 ų
Z:
8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.698(44)
4.527(54)
2.748(62)
2.646(100)
2.450(77)
2.425(37)
1.818(43)
1.778(30)
Comments:
From Type Description.

Type Occurrence of WernerkrauseiteHide

General Appearance of Type Material:
Black prismatic crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museum of Natural History, Bernastrasse 5, CH-3005 Bern, Switzerland, catalogued number NMBE 42804
Geological Setting of Type Material:
Altered xenoliths within alkaline basalts
Associated Minerals at Type Locality:

Synonyms of WernerkrauseiteHide

Other InformationHide

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 WernerkrauseiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Galuskin, E.V., Lazic, B., Blass, G., Widmer, R. and Galuskina, I.O. (2014) Wernerkrauseite, IMA 2014-008. CNMNC Newsletter No. 20, June 2014, page 556; Mineralogical Magazine, 78, 549-558.
Galuskin, E.V., Krüger, B., Krüger, H., Blass, G., Widmer, R., Galuskina, I.O. (2016): Wernerkrauseite, CaFe3+2Mn4+O6 - the first non-stoichiometric post-spinel mineral, from Bellerberg volcano, Eifel, Germany. European Journal of Mineralogy, 28, 485-493

Internet Links for WernerkrauseiteHide

Localities for WernerkrauseiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany (TL)
 
  • Rhineland-Palatinate
    • Ahrweiler
      • Mayen
        • Ettringen
          • Bellerberg volcano
            • Caspar quarry
Galuskin, E.V., Krüger, B., Krüger, H., Blass, G., Widmer, R., Galuskina, I.O. (2016): Wernerkrauseite, CaFe3+2Mn4+O6 - the first non-stoichiometric post-spinel mineral, from Bellerberg volcano, Eifel, Germany. European Journal of Mineralogy, 28, 485-493
Mineral and/or Locality  
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