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Kanemite

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Big Photo

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

Show Kanemite Photos (10)



Formula:
NaHSi
 
2
O
 
5
 · 2H
 
2
O
System:OrthorhombicColour:Colorless to cloudy ...
Hardness:4
Name:Named in 1972 by Gilbert Maglione and Z. Johan after the type locality at Andajia, Kanem (Khanem) Region, Lake Chad, Chad.


Cleaved aggregates may appear similar to gypsum.

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
General Appearance of Type Material:Spherical aggregates, generally < 0.3 mm. The surface of the aggregates may show etched to incised surface markings.
Year of Discovery:1972
Associated Minerals at type locality:
Gaylussite

Occurrences of Kanemite

Geological Setting:Evaoprites

Physical Properties of Kanemite

Lustre:Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):Transparent
Colour:Colorless to cloudy white; light tan possibly due to inclusions
Streak:White
Hardness (Mohs):4
Hardness Data:Measured
Tenacity:Brittle
Cleavage:Perfect
{010} perfect; {100} good
Density (measured):1.93 g/cm3
Density (calculated):1.933 g/cm3

Crystallography of Kanemite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pnma {P21/n 21/m 21/a}
Cell Parameters:a = 7.282Å, b = 20.507Å, c = 4.956Å
Ratio:a:b:c = 0.355 : 1 : 0.242
Unit Cell Volume:V 740.09 ų (Calculated from Unit Cell)
Z:4
Comment:Pnmb
X-Ray Powder Diffraction:
d-spacingIntensity
10.3 (100)
4.01 (100)
3.44 (90)
3.16 (70)
3.09 (70)
2.48 (80)
2.39 (60)
2.00 (50)
Comments:Originally described as monoclinic.

Optical Data of Kanemite

Type:Biaxial (-)
RI values: nα = 1.451 nβ = 1.470 nγ = 1.478
2V:Measured: 46° , Calculated: 64°
Birefringence:0.027
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
Optical Extinction:parallel, XYZ = bac
Pleochroism:Non-pleochroic

Chemical Properties of Kanemite

Formula:
NaHSi
 
2
O
 
5
 · 2H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si
Analytical Data:Decomposed by acids
Common Impurities:Al,Ca,K
Relationship of Kanemite to other Species
Related Minerals - Nickel-Strunz Grouping):

- + 
9.EF.05Petalite
LiAl(Si
 
4
O
 
10
)
9.EF.10Sanbornite
Ba
 
2
(Si
 
4
O
 
10
)
9.EF.15Searlesite
Na(H
 
2
BSi
 
2
O
 
7
)
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
Fluorescence in UV light:Not fluorescent
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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    • Localities for Kanemite
    






    


    

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the  symbol to view information about a locality. 
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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.

    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
    

        • 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
    

    






              • Umbozero mine (Umba mine)
    
    		Igor Pekov analysis
    

    


    

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