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Rokühnite

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Formula:
FeCl2 · 2H2O
Colour:
Colourless
Name:
Named after Robert Kühn, professor of mineralogy.
This page provides mineralogical data about Rokühnite.

Classification of Rokühnite

Approved
3.BB.10

3 : HALIDES
B : Simple halides, with H2O
B : M:X = 1:2
9.2.4.1

9 : NORMAL HALIDES
2 : AX2
8.11.3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
11 : Halides of Fe and Ni
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First Recorded Occurrence of Rokühnite

Physical Properties of Rokühnite

Diaphaneity (Transparency):
Transparent
Colour:
Colourless

Optical Data of Rokühnite

Type:
Biaxial (+)
RI values:
nα = 1.605 nβ = 1.633 nγ = 1.702
2V:
Measured: 64° , Calculated: 68°
Max Birefringence:
δ = 0.097
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong

Chemical Properties of Rokühnite

Formula:
FeCl2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Rokühnite to other Species

3.BB.05EriochalciteCuCl2 · 2H2O
3.BB.15BischofiteMgCl2 · 6H2O
3.BB.20NickelbischofiteNiCl2 · 6H2O
3.BB.25SinjariteCaCl2 · 2H2O
3.BB.30AntarcticiteCaCl2 · 6H2O
3.BB.35TachyhydriteCaMg2Cl6 · 12H2O
8.11.1MolysiteFeCl3
8.11.2HydromolysiteFeCl3 · 6H2O
8.11.4DouglasiteK2[Fe2+Cl4(OH2)2]
8.11.5ErythrosideriteK2[Fe3+Cl5(H2O)]
8.11.6RinneiteK3Na[FeCl6]
8.11.7Kremersite(NH4,K)2[Fe3+Cl5(H2O)]
8.11.8IowaiteMg6Fe23+(OH)16Cl2 · 4H2O
8.11.9NickelbischofiteNiCl2 · 6H2O
8.11.10Lawrencite(Fe2+,Ni)Cl2

Other Names for Rokühnite

Name in Other Languages:
German:Rokühnit
Spanish:Rokühnita

Other Information

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 Rokühnite

Reference List:
American Mineralogist (1981): 66: 219.

Internet Links for Rokühnite

Localities for Rokühnite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Germany
 
  • Lower Saxony
    • Hildesheim
      • Diekholzen Potash works
Andreas Gerstenberg collection
      • Giesen
Aufschluss 1987(4), 114
Aufschluss 87/4
Ukraine
 
  • Zhytomyr Oblast' (Zhitomir Oblast')
Lyckberg, P., Chornousenko, V. & Wilson, W. E. (2009): Volodarsk-Volynski, Zhitomir Oblast, Ukraine. Mineralogical Record, 40, 473-506.
Mineral and/or Locality  
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