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Koenenite

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Formula:
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
System:TrigonalColour: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:3/C.08-20
Nickel-Strunz 10th (pending) edition ID:3.BD.25

3 : HALIDES
B : Simple halides, with H2O
D : Simple halides with H2O and additional OH
Dana 8th edition ID:10.6.2.1

10 : OXYHALIDES AND HYDROXYHALIDES
6 : AmBn(O,OH)pXq
Hey's CIM Ref.: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

Type Locality:Wittekind Mine, Volpriehausen, Solling, Lower Saxony, Germany
Year of Discovery:1902

Physical Properties of Koenenite

Lustre: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 (measured):1.98 g/cm3

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
Maximum Birefringence:δ = 0.030

Chart 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:
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
Simplified for copy/paste:Na4Mg9Al4Cl12(OH)22
Essential elements:Al, Cl, H, Mg, Na, O
All elements listed in formula:Al, Cl, H, Mg, Na, O

Relationship of Koenenite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
3.BD.05Cadwaladerite
AlCl(OH)
 
2
· 4H
 
2
O
3.BD.10Lesukite
Al
 
2
Cl(OH)
 
5
· 2H
 
2
O
3.BD.15Korshunovskite
Mg
 
2
Cl(OH)
 
3
· 4H
 
2
O
3.BD.20Nepskoeite
Mg
 
4
Cl(OH)
 
7
· 6H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
8.6.1Zharchikhite
AlF(OH)
 
2
8.6.2Chloraluminite
AlCl
 
3
· 6H
 
2
O
8.6.3Cadwaladerite
AlCl(OH)
 
2
· 4H
 
2
O
8.6.4Cryolithionite
Na
 
3
Li
 
3
[AlF
 
6
]
 
2
8.6.5Cryolite
Na
 
3
[AlF
 
6
]
8.6.6Chiolite
Na
 
5
Al
 
3
F
 
14
8.6.7Elpasolite
NaK
 
2
[AlF
 
6
]
8.6.8Weberite
Na
 
2
Mg[AlF
 
6
]F
8.6.9Ralstonite
NaMg[Al(F,OH)
 
6
] · H
 
2
O
8.6.11 Chlor-manasseite
Mg
 
x
Al(OH)
 
2x+2
Cl · (x-0.8)H
 
2
O x about 1.75
8.6.12Gearksutite
Ca[Al(F,OH)
 
5
(H
 
2
O)]
8.6.13Prosopite
CaAl
 
2
(F,OH)
 
8
8.6.14Yaroslavite
Ca
 
3
Al
 
2
F
 
10
(OH)
 
2
· H
 
2
O
8.6.15Carlhintzeite
Ca
 
2
[AlF
 
6
]F · H
 
2
O
8.6.16Colquiriite
CaLi[AlF
 
6
]
8.6.17Thomsenolite
NaCa[AlF
 
6
] · H
 
2
O
8.6.18Pachnolite
NaCa[AlF
 
6
] · H
 
2
O
8.6.19Zirklerite
(Fe,Mg,Ca)
 
9
Al
 
4
Cl
 
18
(OH)
 
12
· 14H
 
2
O (?)

Other Names for Koenenite

Synonyms:
Justit (of Koechlin)Korteite
Other Languages:
German:Koenenit
Korteit
Simplified Chinese:氯氧镁铝石
羟氯镁铝石
Spanish:Koenenita
Korteita

Other Information

Other Information:Decomposed by hot water or NH4Cl solution.
Health Warning: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

Search Engines:
  • Look for Koenenite on Google
  • Look for Koenenite images on Google
  • External Links:
  • Look for Koenenite on Webmineral
  • Look for Koenenite on Athena Mineralogy
  • Look for Koenenite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Koenenite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Koenenite specimens for sale - minfind.com
  • Localities for Koenenite

    The 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. ? 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
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    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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