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Engelhauptite

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About EngelhauptiteHide

Formula:
KCu3(V2O7)(OH)2Cl
Colour:
Yellow-brown to brown, typically with an olive green hue
Lustre:
Vitreous
Specific Gravity:
3.86 (Calculated)
Crystal System:
Hexagonal
Name:
Named after the German amateur mineralogist and mineral collector Bernd Engelhaupt (born 1946), who found the mineral.
Structurally related to volborthite, and can be considered as its analogue resulting from the replacement of H2O molecules by the equal amounts of K+ and Cl− ions (Pekov et al 2015).


Classification of EngelhauptiteHide

Approved
Approval Year:
2013

Physical Properties of EngelhauptiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Yellow-brown to brown, typically with an olive green hue
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
3.86 g/cm3 (Calculated)

Optical Data of EngelhauptiteHide

Type:
Uniaxial (+)
RI values:
nω = 1.978() nε = 2.021(4)
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of EngelhauptiteHide

Formula:
KCu3(V2O7)(OH)2Cl

Crystallography of EngelhauptiteHide

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Setting:
P63/mmc
Cell Parameters:
a = 5.922(2) Å, c = 14.513(5) Å
Ratio:
a:c = 1 : 2.451
Unit Cell V:
440.78 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Spherulites (up to 0.2 mm in diameter) and bunches consisting of rough spindle-shaped crystals elongated parallel to [0001].

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.32(98)
4.224(17)
2.979(100)
2.759(19)
2.565(18)
2.424(18)
1.765(16)
1.481(14)
Comments:
From Type Description.

Type Occurrence of EngelhauptiteHide

General Appearance of Type Material:
Spherulites (up to 0.2 mm in diameter) and bunches consisting of rough spindle-shaped crystals. The crystals are up to 0.12 mm long and up to 0.04 mm thick.
Place of Conservation of Type Material:
Type material is deposited in the collections of the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4309/1
Geological Setting of Type Material:
In cavities in nepheline basalts.
Associated Minerals at Type Locality:

Synonyms of EngelhauptiteHide

Other Language Names for EngelhauptiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Volborthite1 photo of Engelhauptite associated with Volborthite on mindat.org.

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 EngelhauptiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Siidra, O.I., Chukanov, N.V. , Yapaskurt, V.O., Britvin, S.N., Krivovichev, S.V., Schüller, W. and Ternes, B. (2013) Engelhauptite, IMA 2013-009. CNMNC Newsletter No. 16, August 2013, page 2702; Mineralogical Magazine, 77, 2695-2709.
Blaß, G. & Kruijen, F. (2014): Die Neufunde aus der Vulkaneifel. Mineralien-Welt 25 (2), 66-81 (in German).
Pekov, I.V., Siidra, O.I., Chukanov, N.V., Yapaskurt, V.O., Britvin, S.N., Krivovichev, S.V., Schüller, W., Ternes, B. (2015): Engelhauptite, KCu3(V2O7)(OH)2 Cl, a new mineral species from Eifel, Germany. Mineralogy and Petrology, 109, 705-711.

Internet Links for EngelhauptiteHide

Localities for EngelhauptiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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
    • Daun
      • Oberstadtfeld
Pekov, I.V., Siidra, O.I., Chukanov, N.V., Yapaskurt, V.O., Britvin, S.N., Krivovichev, S.V., Schüller, W. and Ternes, B. (2013) Engelhauptite, IMA 2013-009. CNMNC Newsletter No. 16, August 2013, page 2702; Mineralogical Magazine, 77, 2695-2709; Blaß, G. & Kruijen, F. (2014): Die Neufunde aus der Vulkaneifel. Mineralien-Welt 25 (2), 66-81 (in German); Pekov, I.V., Siidra, O.I., Chukanov, N.V., Yapaskurt, V.O., Britvin, S.N., Krivovichev, S.V., Schüller, W., Ternes, B. (2015): Engelhauptite, KCu3(V2O7)(OH)2 Cl, a new mineral species from Eifel, Germany. Mineralogy and Petrology, 109, 705-711.
Mineral and/or Locality  
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