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Kanemite

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Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek, Windhoek District, Khomas Region, Namibia
© Bill Lechner

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Formula:
NaHSi
 
2
O
 
4
(OH)
 
2
·2H
 
2
O
System:Orthorhombic
Name:After the type locality at Andajia, Kanem (Khanem) Region, Lake Chad, Chad.
This page provides mineralogical data about Kanemite.

Classification of Kanemite

IMA status:Approved
Strunz 8th edition ID:8/H.05-30
Nickel-Strunz 10th (pending) edition ID:9.EF.25

9 : SILICATES (Germanates)
E : Phyllosilicates
F : Single nets with 6-membered rings, connected by M[4], M[8], etc.
Dana 8th edition ID:73.1.5.1

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
1 : Condensed Tetrahedral Sheets with double layers
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Type Occurrence of Kanemite

Type Locality:Andajia, Kanem (Khanem) Region, Lake Chad, Chad
Year of Discovery:1972

Crystallography of Kanemite

Crystal System:Orthorhombic
Cell Parameters:a = 7.28Å, b = 20.5Å, c = 4.95Å
Ratio:a:b:c = 0.355 : 1 : 0.241
Unit Cell Volume:V 738.74 ų (Calculated from Unit Cell)

Optical Data of Kanemite

Type:Biaxial (-)
RI values: nα = 1.451 nβ = 1.470 nγ = 1.478
2V:Measured: 46° , Calculated: 64°
Maximum Birefringence:δ = 0.027

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r > v distinct

Chemical Properties of Kanemite

Formula:
NaHSi
 
2
O
 
4
(OH)
 
2
·2H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si
Common Impurities:Al,Ca,K

Relationship of Kanemite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EF.05Petalite
LiAlSi
 
4
O
 
10
9.EF.10Sanbornite
Ba
 
2
[Si
 
4
O
 
10
]
9.EF.15Searlesite
NaBSi
 
2
O
 
5
(OH)
 
2
9.EF.20Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O
9.EF.30Yakovenchukite-(Y)
K
 
3
NaCaY
 
2
[Si
 
12
O
 
30
] · 4H
 
2
O

Other Names for Kanemite

Synonyms:
IMA1971-050
Other Languages:
German:Kanemit
Russian:Канемит
Spanish:Kanemita

Other Information

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 Kanemite

Reference List:American Mineralogist (1974): 59: 210.

European Journal of Mineralogy: 11: 125-134.

Bulletin de la Société française de Minéralogie et de Cristallographie (1982): 105: 633.

Internet Links for Kanemite

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  • Raman and XRD data at RRUFF project
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    Localities for Kanemite

    Hide Locality List
    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.
    Chad
     
    • Lake Chad
      • Kanem (Khanem) Region
    		Bull.Soc.fr.Min.Crist.(1972) 95, 372-382
    Kenya
     
    • Rift Valley Province
      • Gregory Rift
    		G. Périnet, J.J. Tiercelin, C.E. Barton : "Présence de kanémite dans les sédiments récents du lac Bogoria, Rift Gregory, Kenya", Bull. Minéral., 1982, 105, 633-639.
    Namibia
     
    • Khomas Region
      • Windhoek District
        • Windhoek
          • Aris
    		Garvie, L. A. J., Devouard, B., Groy, T. L., Cámara, F. and Buseck, P. R. (1999): Crystal structure of kanemite, NaHSi2O5•3H2O, from the Aris phonolite, Namibia. Am. Mineral., 84, 1170-1175.; [http://www.koeln.netsurf.de/~w.steffens/aris.htm]
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Lovozero Massif
    Mineral and/or Locality
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