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About KenyaiteHide

Flag of Kenya
Na2Si22O41(OH)8 · 6H2O
Specific Gravity:
2.33 (Calculated)
Crystal System:
Named by H.P. Eugster in 1967 for the country of Kenya, that includes the type locality.
This page provides mineralogical data about Kenyaite.

Classification of KenyaiteHide

Approval Year:
First Published:
Approval History:

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements

78 : Unclassified Silicates
7 :

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals

Physical Properties of KenyaiteHide

Transparent, Translucent
2.33 g/cm3 (Calculated)

Optical Data of KenyaiteHide

Biaxial (+)
RI values:
nα = 1.480
Max Birefringence:
δ = 1.480
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Only an average n of ~1.480 could be measured.

Chemical Properties of KenyaiteHide

Na2Si22O41(OH)8 · 6H2O
Common Impurities:

Crystallography of KenyaiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
19.68 Å(100)
9.925 Å(50)
4.965 Å(35)
4.689 Å(28)
3.428 Å(85)
3.320 Å(45)
3.198 Å(55)

Type Occurrence of KenyaiteHide

General Appearance of Type Material:
Nodular concretions with chert cores.
Place of Conservation of Type Material:
National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 121336, 121337.
Geological Setting of Type Material:
In beds of magadiite.
Associated Minerals at Type Locality:
Eugster, H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert. Science: 157: 1177-1180.

Synonyms of KenyaiteHide

Other Language Names for KenyaiteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Kenyaite associated with Anorthoclase(Na,K)AlSi3O8
3 photos of Kenyaite associated with StishoviteSiO2
3 photos of Kenyaite associated with MagadiiteNa2Si14O29 · 11H2O
3 photos of Kenyaite associated with CoesiteSiO2
2 photos of Kenyaite associated with ClinoenstatiteMgSiO3

Related Minerals - Nickel-Strunz GroupingHide

9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm (2/m 2/m 2/m) : Cmma
9.HA.50RudenkoiteSr3(Al3.5Si3.5)O10(OH,O)8Cl2 · H2OMon.
9.HA.55FoshallasiteCa3[Si2O7] · 3H2O(?)
9.HA.60NagelschmidtiteCa7(SiO4)2(PO4)2Hex. 6 : P61
9.HA.65Caryochroite(Na,Sr)3(Fe3+,Mg)10[Ti2Si12O37] · (H2O,O,OH)17Mon.
9.HA.70JuaniteCa10Mg4Al2Si11O39 · 4H2O or near
9.HA.75TacharaniteCa12Al2Si18O33 (OH)36Mon.
9.HA.80OyeliteCa10Si8B2O29 · 12.5H2OOrth.
9.HA.90Tiettaite(Na,K)17FeTiSi16O29(OH)30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.1.3RevditeNa16Si16O27(OH)26 · 28H2OMon. 2 : B2
14.1.4MakatiteNa2Si4O8(OH)2 · 4H2OMon. 2/m : P21/b
14.1.5MagadiiteNa2Si14O29 · 11H2OMon.
14.1.7GrumantiteNa(HSi2O5) · H2OOrth. mm2 : Fdd2
14.1.8SilinaiteNaLiSi2O5 · 2H2OMon. 2/m

Other InformationHide

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 KenyaiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Eugster, H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert. Science: 157: 1177-1180.
Fleischer, M. (1968) New mineral names. American Mineralogist: 53: 507-511.
McAtee, J.L., House, R., Eugster, H.P. (1968) Magadiite from Trinity County, California. American Mineralogist: 53: 2061-2069.
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.
Beneke, K., Lagley, G. (1983) Kenyaite - synthesis and properties. American Mineralogist: 68: 818-826.
Almond, G.G., Harris, R.K., Franklin, K.R. (1997) A structural consideration of kanemite, octosilicate, magadiite and kenyaite. Journal of Materials Chemistry: 7: 681-687.
Eypert-Blaison, C., Villieras, F., Michiot, L.J., Pelletier, M., Humbert, B., Ghanbaja, J., Yvon, J. (2002) Surface heterogeneity of kanemite, magadiite and kenyaite: a high-resolution gas adsorption study. Clay Minerals: 37(3): 531-542.
Zubkova, N.V., Pekov, I.V., Pushcharovsky, D.Y. (2014) A review of crystal chemistry of natural silicates of alkaline elements in the light of new structural data. Mineralogical Magazine: 78: 253-265.

Internet Links for KenyaiteHide

Localities for KenyaiteHide

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.
  • Eastern Antarctica
    • Victoria Land
      • Ross Archipelago
        • Ross Island
Museum Victoria (Victoria Australia) Registration Number: M 51899
  • Québec
    • Montérégie
      • Lajemmerais RCM
        • Varennes & St-Amable
          • Saint-Amable sill
Can. Museum of Nature collection - XRD
Kenya (TL)
  • Kajiado County
McAtee, J.L., House, R., Eugster, H.P. (1968) Magadiite from Trinity County, California. The American Mineralogist, 53, 2061-2069. HB2/1 (1995).
  • Khomas Region
    • Windhoek Rural
      • Aris
G. Niedermayr (2005): Pers. comm. to U. Kolitsch; Blaß, G., Kolitsch, U., Tremmel, G., Esche, J. (2016): Neue Mineralienfunde aus den Phonolithbrüchen von Aris in Namibia. Mineralien-Welt 27 (4), 48-60 (in German); Kolitsch, U., Blaß, G., Jahn, S., Cámara, F., von Bezing, L., Wartha, R. R., Tremmel, G., Sturla, M., Cerea, P., Skebo, M. and Ciriotti, M. E. (2016): Aris - mineralogy of the famous alkaline phonolite. AMI - Associazione Micromineralogica Italiana, Cremona, Italy, 95 pp.
  • Diffa
    • N'guigmi Department
Sebag, D., Verrecchia, E.P., Lee, S.-J., Durand, A. (2001) The natural hydrous sodium silicates from the northern bank of Lake Chad: occurrence, petrology and genesis. Sedimentary Geology, 139(1), 15-31.
  • Orenburg Oblast
    • Adamovsky District
  • California
    • San Bernardino Co.
      • Silver Lake Mining District
        • Soda Mountains
          • Baker
            • Otto Mountain
collected by and in the collection of Eckhard D. Stuart; PXRD confirmed by Anthony Kampf
    • Siskiyou Co.
      • Azalea
        • Box Canyon Dam
Bricker, O.P. (1969), Stability constants and Gibbs free energies of formation of magadiite and kenyaite: American Mineralogist: 54: 1032-1033; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 442.
    • Trinity Co.
      • Klamath Mountains
        • Trinity Mountains
          • Halls Gulch Mining District
            • Wildcat Peak
Barnes, I., J.B. Rapp & J.R. O’Neil (1972), Metamorphic assemblages and the direction of flow of metamorphic fluids in four instances of serpentinization: Contributions to Mineralogy and Petrology: 35: 264; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 442;; Lukasz Kruszewski specimen.
  • Nevada
    • Nye Co.
NBMG Spec. Pub. 31 Minerals of Nevada
  • New Mexico
    • Colfax Co.
      • Springer
        • Point of Rocks Mesa (Pecks Mesa)
DeMark, R. S. (1989): Micromounting in New Mexico. Mineralogical Record. 20: 64.
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