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Koenenite

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Formula:
Na4Mg9Al4Cl12(OH)22
System:
Trigonal
Colour:
Colourless; tinted pale ...
Hardness:
Name:
After Adolf von Koenen (1837-1915), of Göttingen, geologist, who first identified the mineral.
This page provides mineralogical data about Koenenite.

Classification of Koenenite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
3.BD.25

3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
10.6.2.1

10 : OXYHALIDES AND HYDROXYHALIDES
6 : AmBn(O,OH)pXq
8.6.10

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
6 : Halides of Al
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Type Occurrence of Koenenite

Year of Discovery:
1902

Physical Properties of Koenenite

Pearly
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless; tinted pale yellow to deep red due to included hematite. Reddish brown to colourless in transmitted light.
Hardness (Mohs):
Cleavage:
Perfect
On {0001}.
Density:
1.98 g/cm3 (Measured)    

Crystallography of Koenenite

Crystal System:
Trigonal
Morphology:
Small crystals as crusts; very acute scalenohedra and rhombohedra; rosettes of intergrown tablets. Crystals indistinct.

Optical Data of Koenenite

Type:
Uniaxial (+)
RI values:
nω = 1.520 nε = 1.550
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Visible
Comments:
Dichroic: O = red-brown; E = colourless

Chemical Properties of Koenenite

Formula:
Na4Mg9Al4Cl12(OH)22
Essential elements:
All elements listed in formula:

Relationship of Koenenite to other Species

3.BD.05CadwaladeriteAlCl(OH)2 · 4H2O
3.BD.10LesukiteAl2Cl(OH)5 · 2H2O
3.BD.15KorshunovskiteMg2Cl(OH)3 · 4H2O
3.BD.20NepskoeiteMg4Cl(OH)7 · 6H2O
8.6.1ZharchikhiteAlF(OH)2
8.6.2ChloraluminiteAlCl3 · 6H2O
8.6.3CadwaladeriteAlCl(OH)2 · 4H2O
8.6.4CryolithioniteNa3Li3[AlF6]2
8.6.5CryoliteNa3[AlF6]
8.6.6ChioliteNa5Al3F14
8.6.7ElpasoliteNaK2[AlF6]
8.6.8WeberiteNa2Mg[AlF6]F
8.6.9RalstoniteNaMg[Al(F,OH)6] · H2O
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]
8.6.13ProsopiteCaAl2(F,OH)8
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2O
8.6.15CarlhintzeiteCa2[AlF6]F · H2O
8.6.16ColquiriiteCaLi[AlF6]
8.6.17ThomsenoliteNaCa[AlF6] · H2O
8.6.18PachnoliteNaCa[AlF6] · H2O
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)

Other Names for Koenenite

Name in Other Languages:

Other Information

Other Information:
Decomposed by hot water or NH4Cl solution.
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 Koenenite

Reference List:
Rinne (1902) Centralblatt für Mineralogie, Geologie und Paleontologie, Stuttgart: 493.

Koechlin (1903) Mineralogische und petrographische Mitteilungen, Vienna: 23: 97.

Neues Jahrbuch für Mineralogie, Monatshefte (1951): 1-16.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged: 86-87.

Neues Jahrbuch für Mineralogie, Abhandlungen (1961): 97: 112-141.

Zeitschrift für Kristallographie (1968): 126: 7-22.

Internet Links for Koenenite

Localities for Koenenite

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.
China
 
  • Qinghai Province
    • Haixi Autonomous Prefecture
      • Golmud Co. (Ge'ermu Co.)
Dongsheng Hu (1995): Journal of Lake Sciences 7(4), 327-333
  • Yunnan Province
    • Pu'er Prefecture
      • Jiangcheng Co.
Jinding Liu and Qun Liu (1984): Acta Petrologica Mineralogica et Analytica 3(2), 131-138
Germany
 
  • Lower Saxony
    • Celle
      • Hänigsen
Bode "Mineralien und Fundstellen BRD" from 1989 ISBN 3-925094-24-5 Pg.9
      • Wathlingen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Hanover
      • Lehrte
    • Helmstedt
      • Grasleben
Emser Hefte 1990(1), 11-23
      • Königslutter am Elm
Denise Bicknell collection
    • Hildesheim
      • Sarstedt
Dana 7:II:87.
    • Lüneburg
Wittern: "Mineralfundorte in Deutschland", 2001
    • Solling
      • Volpriehausen
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 87.
Wittern: "Mineralfundorte in Deutschland", 2001
  • Saxony-Anhalt
Wittern: "Mineralfundorte in Deutschland", 2001
Mineral and/or Locality  
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