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Kenyaite

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About KenyaiteHide

04257440015037879773149.jpg
Flag of Kenya
Formula:
Na2Si22O41(OH)8 · 6H2O
Colour:
White
Specific Gravity:
2.33 (Calculated)
Crystal System:
Monoclinic
Name:
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

Approved
Approval Year:
1967
First Published:
1967
Approval History:
IMA1967-018
9.HA.10

9 : SILICATES (Germanates)
H : Unclassified silicates
A : With Alkali and Alkali-earth Elements
78.7.7.1

78 : Unclassified Silicates
7 :
14.1.6

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

Physical Properties of KenyaiteHide

Transparency:
Transparent, Translucent
Colour:
White
Density:
2.33 g/cm3 (Calculated)

Optical Data of KenyaiteHide

Type:
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:
Moderate
Dispersion:
none
Comments:
Only an average n of ~1.480 could be measured.

Chemical Properties of KenyaiteHide

Formula:
Na2Si22O41(OH)8 · 6H2O
Common Impurities:
Ti,Al,Fe,Mn,Ca,K

Crystallography of KenyaiteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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:
Reference:
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

German:Kenyait
Spanish:Kenyaita

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.05ErtixiiteNa2Si4O9Iso.
9.HA.20WawayandaiteCa6Mn2BBe9Si6O23(OH,Cl)15Mon.
9.HA.25MagbasiteKBaFe3+Mg7Si8O22(OH)2F6Orth. mmm (2/m 2/m 2/m) : Cmma
9.HA.30AfanasyevaiteCa8[Si2O7]OCl2
9.HA.40IgumnoviteCa3Al2(SiO4)2Cl4Iso.
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.85DenisoviteK14+x(Ca,Na,Mn,Fe)48[Si60O162]F16(Ox,OH4−x)·2H2OMon.
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

14.1.1NatrosiliteNa2Si2O5Mon.
14.1.2ErtixiiteNa2Si4O9Iso.
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.
Antarctica
 
  • Eastern Antarctica
    • Victoria Land
      • Ross Archipelago
        • Ross Island
Museum Victoria (Victoria Australia) Registration Number: M 51899
Canada
 
  • 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).
Namibia
 
  • 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.
Niger
 
  • 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.
Russia
 
  • Orenburg Oblast
    • Adamovsky District
http://webmineral.ru/deposits/item.php?id=3037
USA
 
  • 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; www.mineralsocal.org.; 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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