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Vondechenite

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About VondecheniteHide

Heinrich von Dechen
Formula:
Cu4CaCl2(OH)8 · 4H2O
Colour:
Sky blue
Lustre:
Vitreous
Specific Gravity:
2.931 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honour for Ernst Heinrich von Dechen, born on 25 March 1800 in Berlin. For the Rhineland and Westfalia von Dechen has been a pioneer. His scientific achievements comprise the publication of the first comprehensive geological maps of the western part of Germany “Erläuterungen zur geologischen Karte der Rheinprovinz und der Provinz Westfalen sowie einiger angrenzender Gegenden” (1870 + 1884). He made numerous contributions to the geological literature, especially on the geology of the Eifel. His descriptions "Geognostischer Führer zu der Vulkanreihe der Vordereifel" (1861) and "Geognostischer Führer zu dem Laacher See und seiner vulkanischen Umgebung" (1864) are still important. He died in Bonn,15 February 1889.
Blue, tiny platelets within matrix.

Chemically related to centennialite and dioskouriite.


Classification of VondecheniteHide

Approved
Approval Year:
2016
First Published:
2018
Approval History:
IMA 2016-065

Physical Properties of VondecheniteHide

Vitreous
Transparency:
Translucent
Colour:
Sky blue
Streak:
Pale blue
Tenacity:
Brittle
Cleavage:
Distinct/Good
on (010)
Parting:
not observed
Fracture:
Irregular/Uneven
Density:
2.931 g/cm3 (Calculated)

Optical Data of VondecheniteHide

Type:
Biaxial (-)
RI values:
nα = 1.601 nβ = 1.723 nγ = 1.726
2V:
Calculated: 16.53°
Max Birefringence:
δ = 0.125
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Weak
Comments:
Parallel (010) cyan, perpendicular (010) bright cyan

Chemical Properties of VondecheniteHide

Formula:
Cu4CaCl2(OH)8 · 4H2O

Crystallography of VondecheniteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmcm
Cell Parameters:
a = 6.653(1) Å, b = 15.034(3) Å, c = 6.611(1) Å
Ratio:
a:b:c = 0.443 : 1 : 0.44
Unit Cell V:
661.3 ų
Z:
2
Morphology:
Vondechenite forms crystals tabular on (010) that arrange in subparallel groups. The only observed form is the pinakoid {010}.
Twinning:
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
7.596(100)
3.070(39)
2.520(49)
2.484(66)
1.730(39)
1.485(29)

Type Occurrence of VondecheniteHide

General Appearance of Type Material:
Sky-blue tiny aggregates embedded in a white fine-grained matrix consisting of jennite and ettringite.
Place of Conservation of Type Material:
Holotype specimen (MM 1366) is deposited in the Mineralogical Museum of the University of Hamburg, Grindelallee 48, D-20146 Hamburg, Germany.
Empirical Formula of Type Material:
Ca1.01(Cu3.97Fe0.02)Cl2.03(OH)7.97·3.58H2O
Chemical Analysis of Type Material:
CaO10.44 %
CuO58.25 %
Fe0.33 %
Cl13.31 %
O = Cl-3.01 %
H2O calc.25.14 %
Total:104.46 %
Geological Setting of Type Material:
(Auto)-hydrothermal alteration of a Ca-rich xenolith (skarn).
Associated Minerals at Type Locality:
Reference:
Schlüter, J., Malcherek, T., Pohl, D., Schäfer, C. (2018): Vondechenite, a new hydrous calcium copper chloride hydroxide, from the Bellerberg, East-Eifel volcanic area, Germany. Neues Jahrbuch fur Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 195, 79-86.

Synonyms of VondecheniteHide

Other Language Names for VondecheniteHide

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 VondecheniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Blass, G., H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German) [as unnamed "Ca-Cu-Chlorid"]
Schlüter, J., Malcherek, T., Pohl, D., Schäfer, C. (2016): Vondechenite, IMA 2016-065, CNMNC Newsletter No. 34, December 2016, Mineralogical Magazine: 80: 1315–1321
Schlüter, J., Malcherek, T., Pohl, D., Schäfer, C. (2018): Vondechenite, a new hydrous calcium copper chloride hydroxide, from the Bellerberg, East-Eifel volcanic area, Germany. Neues Jahrbuch fur Mineralogie - Abhandlungen: Journal of Mineralogy and Geochemistry, 195, 79-86.

Internet Links for VondecheniteHide

Localities for VondecheniteHide

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
    • Mayen
      • Ettringen
        • Bellerberg volcano
          • Caspar quarry
Blass, G., H.-W. Graf, U. Kolitsch and D. Sebold (2009): The new finds from the volcanic Eifel (II). Mineralien-Welt 20 (2), 38-49. (in German) [as unnamed "Ca-Cu-Chlorid]. Schlüter, J., Malcherek, T., Pohl, D., Schäfer, C. (2018): Vondechenite, a new hydrous calcium copper chloride hydroxide, from the Bellerberg, East-Eifel volcanic area, Germany. Neues Jahrbuch fur Mineralogie - Abhandlungen, 195, 79-86.
Mineral and/or Locality  
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