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Kenyaite

Big Photo

Mt Erebus, Ross Island, Victoria Land, Eastern Antarctica, Antarctica
© Maurice de Graaf

Formula:
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
·6H
 
2
O
System:Monoclinic
This page provides mineralogical data about Kenyaite.

Classification of Kenyaite

IMA status:Approved
Strunz 8th edition ID:8/D.13-10
Nickel-Strunz 10th (pending) edition ID:9.HA.10

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
Dana 8th edition ID:78.7.7.1

78 : Unclassified Silicates
7 :
Hey's CIM Ref.:14.1.6

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
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Type Occurrence of Kenyaite

Type Locality:Lake Magadi, South Rift Valley, Rift Valley Province, Kenya
Year of Discovery:1967

Crystallography of Kenyaite

Crystal System:Monoclinic
Cell Parameters:a = 7.79Å, b = 19.72Å, c = 7.3Å
β = 95.9°
Ratio:a:b:c = 0.395 : 1 : 0.37
Unit Cell Volume:V 1,115.48 ų (Calculated from Unit Cell)

Optical Data of Kenyaite

Type:Biaxial (+)
RI values: nα = 1.480
Maximum Birefringence:δ = 1.480

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:none

Chemical Properties of Kenyaite

Formula:
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
·6H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si
Common Impurities:Ti,Al,Fe,Mn,Ca,K

Relationship of Kenyaite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HA.05Ertixiite
Na
 
2
Si
 
4
O
 
9
9.HA.20Wawayandaite
Ca
 
6
Mn
 
2
BBe
 
9
Si
 
6
O
 
23
(OH,Cl)
 
15
9.HA.25Magbasite
KBa(Al,Sc)(Mg,Fe)
 
6
Si
 
6
O
 
20
F
 
2
9.HA.30Afanasyevaite
Ca
 
8
[Si
 
2
O
 
7
]OCl
 
2
9.HA.40Igumnovite
Ca
 
3
Al
 
2
(SiO
 
4
)
 
2
Cl
 
4
9.HA.50Rudenkoite
Sr
 
3
(Al
 
3.5
Si
 
3.5
)O
 
10
(OH,O)
 
8
Cl
 
2
·H
 
2
O
9.HA.55Foshallasite
Ca
 
3
[Si
 
2
O
 
7
] · 3H
 
2
O(?)
9.HA.60Nagelschmidtite
Ca
 
7
[PO
 
4
|SiO
 
4
]
 
2
9.HA.65Caryochroite
(Na,Sr)
 
3
(Fe
3+
 
,Mg)
 
10
[(O,OH)
 
9
|Ti
 
2
Si
 
12
O
 
37
] ·(H
 
2
O, O, OH)
 
17
9.HA.70Juanite
Ca
 
10
Mg
 
4
Al
 
2
Si
 
11
O
 
39
·4H
 
2
O or near
9.HA.75Tacharanite
Ca
 
12
Al
 
2
Si
 
18
O
 
51
·18H
 
2
O
9.HA.80Oyelite
Ca
 
10
Si
 
8
B
 
2
O
 
29
·12.5H
 
2
O
9.HA.85Denisovite
Ca
 
2
(K,Na)Si
 
3
O
 
8
(F,OH)
 
2
9.HA.90Tiettaite
(Na,K)
 
17
FeTiSi
 
16
O
 
29
(OH)
 
30
·2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.1.1Natrosilite
Na
 
2
Si
 
2
O
 
5
14.1.2Ertixiite
Na
 
2
Si
 
4
O
 
9
14.1.3Revdite
Na
 
16
Si
 
16
O
 
27
(OH)
 
26
·28H
 
2
O
14.1.4Makatite
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
·4H
 
2
O
14.1.5Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
14.1.7Grumantite
Na[Si
 
2
O
 
4
(OH)]·H
 
2
O
14.1.8Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O

Other Names for Kenyaite

Synonyms:
IMA1967-018
Other Languages:
German:Kenyait
Spanish:Kenyaita

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 Kenyaite

Reference List:American Mineralogist (1968): 53: 510, 2061.

Bricker, O.P. (1969), Stability constants and Gibbs free energies of formation of magadiite and kenyaite: American Mineralogist: 54: 1026-1033.

Bulletin de la Société française de Minéralogie et de Cristallographie (1972): 95: 371-382.

Internet Links for Kenyaite

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  • Look for Kenyaite on Wikipedia
  • Look for Kenyaite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Kenyaite in the Natural History Museum (London) online catalogue
  • Kenyaite details from Handbook of Mineralogy (PDF)
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    Localities for Kenyaite

    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.
    Antarctica
     
    • Eastern Antarctica
      • Victoria Land
        • Ross Island
    Kenya
     
    • Rift Valley Province
      • South Rift Valley
    		AM 53 (1968), 2061; HB2/1 (1995)
    Namibia
     
    • Khomas Region
      • Windhoek District
        • Windhoek
          • Aris
    		G. Niedermayr (2005): Pers. comm. to U. Kolitsch
    USA
     
    • California
      • Trinity Co.
        • Trinity Center
    		www.mineralsocal.org
    • Nevada
      • Nye Co.
    		NBMG Spec. Pub. 31 Minerals of Nevada
    • New Mexico
      • Colfax Co.
        • Springer
          • Point of Rocks Mesa (Pecks Mesa)
    		Minerals of New Mexico 3rd ed.
    Mineral and/or Locality
    Google
     
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