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Koenenite

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About KoeneniteHide

02376300014946260062192.jpg
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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0010653KoeneniteAllmann R, Lohse H N, Hellner E (1968) Die kristallstruktur des koenenits, eine doppelschichtstruktur mit zwei inkommensurablen teilgittern Zeitschrift fur Kristallographie 126 7-2219680293
0010654KoeneniteAllmann R, Lohse H N, Hellner E (1968) Die kristallstruktur des koenenits, eine doppelschichtstruktur mit zwei inkommensurablen teilgittern Zeitschrift fur Kristallographie 126 7-2219680293
CIF Raw Data - click here to close

Geological EnvironmentHide

Geological Setting:
marine evaporates

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:
1 photo of Koenenite associated with AnhydriteCaSO4

Related Minerals - Nickel-Strunz GroupingHide

3.BD.05CadwaladeriteAl5(H2O)3(OH)12·n(Cl,H2O)Amor.
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.
8.6.3CadwaladeriteAl5(H2O)3(OH)12·n(Cl,H2O)Amor.
8.6.4CryolithioniteNa3Al2(LiF4)3Iso. 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

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
 
  • Saskatchewan
    • Esterhazy
Kiihn, R. (1968). Geochemistry of the German potash deposits. Geol. Soc. Am., Spec. Pap, 88, 427-504.; Wardlaw, N. C. (1968). Carnallite-sylvite relationships in the Middle Devonian Prairie evaporite formation, Saskatchewan. Geological Society of America Bulletin, 79(10), 1273-1294.
China
 
  • Qinghai
    • Haixi Mongol and Tibetan Autonomous Prefecture
      • Golmud City (Ge'ermu Co.)
Dongsheng Hu (1995): Journal of Lake Sciences 7(4), 327-333
  • Yunnan
    • Pu'er
      • Jiangcheng County
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 District
      • Wathlingen
Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
    • Hanover Region
      • Lehrte
RRUFF ID: R060989
      • Uetze
        • Hänigsen
Bode "Mineralien und Fundstellen BRD" from 1989 ISBN 3-925094-24-5 Pg.9; Krupp, R. E. (2005). Formation and chemical evolution of magnesium chloride brines by evaporite dissolution processes—Implications for evaporite geochemistry. Geochimica et Cosmochimica Acta, 69(17), 4283-4299.
    • Helmstedt District
      • Grasleben
Emser Hefte 1990(1), 11-23
      • Königslutter am Elm
Denise Bicknell collection
    • Hildesheim District
      • Sarstedt
Dana 7:II:87.
    • Lüneburg District
      • Lüneburg
Wittern: "Mineralfundorte in Deutschland", 2001
    • Northeim District
      • Uslar
        • 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
    • Börde
      • Ingersleben
Mertineit, M.; Schramm, M. (2019) Lithium Occurrences in Brines from two German Salt Deposits (Upper Permian) and First Results of Leaching Experiments. Minerals 9, 766.
Wittern: "Mineralfundorte in Deutschland", 2001
 
Mineral and/or Locality  
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