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Douglasite

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Formula:
K2[Fe2+Cl4(OH2)2]
Colour:
Light green; brownish red on exposure.
Lustre:
Vitreous
Specific Gravity:
2.04 (Calculated)
Crystal System:
Monoclinic
Name:
For the type locality, Douglashall near Westeregeln, Saxony, Germany.
This page provides mineralogical data about Douglasite.


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Classification of DouglasiteHide

Approved, 'Grandfathered' (first described prior to 1959)
3.CJ.20

3 : HALIDES
C : Complex halides
J : With MX6 complexes; M = Fe, Mn, Cu
11.3.1.1

11 : HALIDE COMPLEXES
3 : AmBX4·xH2O
8.11.4

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

Physical Properties of DouglasiteHide

Vitreous
Colour:
Light green; brownish red on exposure.
Density:
2.04 g/cm3 (Calculated)

Optical Data of DouglasiteHide

Type:
Biaxial (+)
RI values:
nα = 1.488 nβ = 1.488 nγ = 1.500
2V:
Measured: 5°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of DouglasiteHide

Formula:
K2[Fe2+Cl4(OH2)2]
IMA Formula:
K2Fe2+Cl4 · 2H2O

Crystallography of DouglasiteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 11.8 Å, b = 16.27 Å, c = 8.225 Å
β = 104.89°
Ratio:
a:b:c = 0.725 : 1 : 0.506
Unit Cell V:
1526 ų
Z:
6
Morphology:
Coarsely granular masses.

Type Occurrence of DouglasiteHide

General Appearance of Type Material:
Coarsely granular masses.
Associated Minerals at Type Locality:

Other Language Names for DouglasiteHide

Related Minerals - Nickel-Strunz GroupingHide

3.CJ.05ChlormanganokaliteK4[MnCl6]Trig.
3.CJ.05RinneiteK3Na[FeCl6]Trig. 3m (3 2/m) : R3c
3.CJ.10ErythrosideriteK2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m) : Pnma
3.CJ.10Kremersite(NH4,K)2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m)
3.CJ.15MitscherlichiteK2CuCl4 · 2H2OTet. 4/mmm (4/m 2/m 2/m)
3.CJ.25Redikortsevite(NH4)MgCl3 · 6H2OOrth.
3.CJ.30Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)Trig.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.11.1MolysiteFeCl3Hex.
8.11.2HydromolysiteFeCl3 · 6H2O
8.11.3RokühniteFeCl2 · 2H2OMon.
8.11.5ErythrosideriteK2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m) : Pnma
8.11.6RinneiteK3Na[FeCl6]Trig. 3m (3 2/m) : R3c
8.11.7Kremersite(NH4,K)2[Fe3+Cl5(H2O)]Orth. mmm (2/m 2/m 2/m)
8.11.8IowaiteMg6Fe3+2(OH)16Cl2 · 4H2OTrig. 3m (3 2/m) : R3m
8.11.9NickelbischofiteNiCl2 · 6H2OMon.
8.11.10Lawrencite(Fe2+,Ni)Cl2Trig. 3m (3 2/m) : R3m

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 DouglasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ochsenius (1877) Steinsalzlager, Halle: 94.
Precht, H. (1880): Ueber die Bildung des Wasserstoffs in den Stassfurter Precht Kalisalzbergwerken.- Berichte der Deutschen Chemischen Gesellschaft Berlin 13, 2326-2328.
Boeke (1909) Neues Jahrbuch für Mineralogie, Geologie und Paleontologie, Heidelberg, Stuttgart: II: 44.
Larsen, E.S. (1921) The Microscopic Determination of the Nonopaque Minerals, First edition, USGS Bulletin 679: 69.
Palache, Charles, Harry Berman & Clifford Frondel (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Seventh edition, Volume II: 100.

Internet Links for DouglasiteHide

Localities for DouglasiteHide

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.
Canada
 
  • Northwest Territories
    • Mackenzie District
      • Fort Norman
Battler, M. M., Osinski, G. R., Lim, D. S., Davila, A. F., Michel, F. A., Craig, M. A., ... & Preston, L. J. (2013). Characterization of the acidic cold seep emplaced jarositic Golden Deposit, NWT, Canada, as an analogue for jarosite deposition on Mars. Icarus, 224(2), 382-398.
Germany (TL)
 
  • Saxony-Anhalt
    • Stassfurt Potash deposit
      • Egeln
        • Westeregeln
H. Precht (1880): Ueber die Bildung des Wasserstoffs in den Stassfurter Kalisalzbergwerken.- Berichte der Deutschen Chemischen Gesellschaft Berlin 13, 2326-2328
Poland
 
  • Wielkopolskie
Wachowiak, J., Pieczka, A. (2016): Motukoreaite from the Kłodawa Salt Dome, Central Poland. Mineralogical Magazine, 80, 277-289
Mineral and/or Locality  
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