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Koenenite

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About KoeneniteHide

Adolf von Koenen
Formula:
Na4Mg9Al4Cl12(OH)22
Colour:
Colourless; tinted pale yellow to deep red due to included hematite. Reddish brown to colourless in transmitted light.
Lustre:
Pearly
Hardness:
Specific Gravity:
1.82 - 2.08
Crystal System:
Trigonal
Name:
After Adolf von Koenen (21 March 1837, Potsdam – 5 May 1915, Göttingen), of Göttingen, geologist/paleontologist, who first identified the mineral.
This page provides mineralogical data about Koenenite.


Classification of KoeneniteHide

Approved, 'Grandfathered' (first described prior to 1959)
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

Physical Properties of KoeneniteHide

Pearly
Transparency:
Transparent, Translucent
Comment:
on cleavage surfaces
Colour:
Colourless; tinted pale yellow to deep red due to included hematite. Reddish brown to colourless in transmitted light.
Hardness:
1½ on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
On {0001}.
Density:
1.82 - 2.08 g/cm3 (Measured)    1.82 g/cm3 (Calculated)

Optical Data of KoeneniteHide

Type:
Uniaxial (+)
RI values:
nω = 1.520 nε = 1.550
2V:
Measured: 10°
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 KoeneniteHide

Formula:
Na4Mg9Al4Cl12(OH)22

Crystallography of KoeneniteHide

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 4.072(2) Å, c = 32.64(2) Å
Ratio:
a:c = 1 : 8.016
Unit Cell V:
468.70 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Small crystals as crusts; very acute scalenohedra and rhombohedra; rosettes of intergrown tablets. Crystals indistinct.

Type Occurrence of KoeneniteHide

Synonyms of KoeneniteHide

Other Language Names for KoeneniteHide

Common AssociatesHide

AnhydriteCaSO4
CarnalliteKMgCl3 · 6H2O
HaliteNaCl
HematiteFe2O3
KieseriteMgSO4 · H2O
SylviteKCl
Associated Minerals Based on Photo Data:
Anhydrite1 photo of Koenenite associated with Anhydrite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

3.BD.05CadwaladeriteAlCl(OH)2 · 4H2OAmor.
3.BD.10LesukiteAl2Cl(OH)5 · 2H2OIso. m3m (4/m 3 2/m) : Im3m
3.BD.15KorshunovskiteMg2Cl(OH)3 · 4H2OTric.
3.BD.20NepskoeiteMg4Cl(OH)7 · 6H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

8.6.1ZharchikhiteAlF(OH)2Mon.
8.6.2ChloraluminiteAlCl3 · 6H2OTrig.
8.6.3CadwaladeriteAlCl(OH)2 · 4H2OAmor.
8.6.4CryolithioniteNa3Li3[AlF6]2Iso. m3m (4/m 3 2/m) : Ia3d
8.6.5CryoliteNa2NaAlF6Mon. 2/m
8.6.6ChioliteNa5Al3F14Tet. 4/mmm (4/m 2/m 2/m) : P4/mnc
8.6.7ElpasoliteK2NaAlF6Iso. m3 (2/m 3) : Pa3
8.6.8WeberiteNa2Mg[AlF6]FOrth. mmm (2/m 2/m 2/m) : Immm
8.6.9Hydrokenoralstonite Na0.5(Al,Mg)2(F,OH)6•H2O Iso. m3m (4/m 3 2/m) : Fd3m
8.6.11 Chlor-manasseiteMgxAl(OH)2x+2Cl · (x-0.8)H2O
x about 1.75
8.6.12GearksutiteCa[Al(F,OH)5(H2O)]Tric. 1 : P1
8.6.13ProsopiteCaAl2F4[(OH)4-xFx], x = 0.0–1.0Mon. 2/m : B2/b
8.6.14YaroslaviteCa3Al2F10(OH)2 · H2OOrth.
8.6.15CarlhintzeiteCa2[AlF6]F · H2OTric.
8.6.16ColquiriiteCaLi[AlF6]Trig.
8.6.17ThomsenoliteNaCa[AlF6] · H2OMon. 2/m : P21/b
8.6.18PachnoliteNaCa[AlF6] · H2OMon. 2/m
8.6.19Zirklerite(Fe,Mg,Ca)9Al4Cl18(OH)12 · 14H2O (?)Trig.

Other InformationHide

Notes:
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 KoeneniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rinne F (1902) Koenenit. Centralblatt für Mineralogie, Geologie und Paläontologie 1902, 493-499
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.
Allmann R, Lohse H N, Hellner E (1968) Die kristallstruktur des koenenits, eine doppelschichtstruktur mit zwei inkommensurablen teilgittern. Zeitschrift für Kristallographie (1968): 126: 7-22.

Internet Links for KoeneniteHide

Localities for KoeneniteHide

ⓘ - 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.
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; Li, M., Yan, M., Wang, Z., Liu, X., Fang, X., & Li, J. (2015). The origins of the Mengye potash deposit in the Lanping–Simao Basin, Yunnan Province, Western China. Ore Geology Reviews, 69, 174-186.
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
RRUFF ID: R060989
    • 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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