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Koenenite

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Bergmannssegen-Hugo Mine, Lehrte, Hanover, Lower Saxony, Germany
© Thomas Witzke

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Formula:
Na
 
4
Mg
 
9
Al
 
4
Cl
 
12
(OH)
 
22
System:TrigonalColour:Colourless; tinted pale ...
Hardness:1½
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
mindat.org URL:http://www.mindat.org/min-2306.html
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Type Occurrence of Koenenite

Type Locality:Wittekind Mine, Volpriehausen, Solling Mts, 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):1½
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
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
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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Koenenite details from Handbook of Mineralogy (PDF)
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    • 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.
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    (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.
    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 Mts
        • 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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