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About EakeriteHide

Ca2SnAl2Si6O18(OH)2 · 2H2O
Colourless, white
Specific Gravity:
Crystal System:
Named in honor of Jack Eaker (26 October 1930, York County, South Carolina, USA - ), lab analyst for the Foote Mineral Company at Kings Mountain, North Carolina, USA. He discovered the mineral and suspected it was a new species. The name is pronounced ēkerait.
This page provides mineralogical data about Eakerite.

Classification of EakeriteHide

Approval Year:
First Published:

9 : SILICATES (Germanates)
C : Cyclosilicates
G : [Si4O12]8- branched 4-membered single rings

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
1 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings

16 : Silicates Containing Aluminum and other Metals
14 : Aluminosilicates of Ti, Zr, Sn and Pb

Physical Properties of EakeriteHide

Colourless, white
5½ on Mohs scale
None Observed
None observed
2.93(1) g/cm3 (Measured)    2.931 g/cm3 (Calculated)
Measured flawless crystals by immersion in Clerici solution

Optical Data of EakeriteHide

Biaxial (+)
RI values:
nα = 1.584 nβ = 1.586 nγ = 1.600
Measured: 35° , Calculated: 42°
Max Birefringence:
δ = 0.016
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of EakeriteHide

Ca2SnAl2Si6O18(OH)2 · 2H2O
IMA Formula:
Ca2Sn4+Al2Si6O18(OH)2 · 2H2O

Crystallography of EakeriteHide

Crystal System:
Cell Parameters:
a = 15.83 Å, b = 7.72 Å, c = 7.44 Å
β = 101.31°
a:b:c = 2.051 : 1 : 0.964
Unit Cell V:
891.57 ų (Calculated from Unit Cell)
Prismatic crystals. Forms, in order of abundance (type material) are: {111}, {210}, {410}, {201}, {-20l}, {001}, and {100.}

X-Ray Powder DiffractionHide

Powder Diffraction Data:
4.812 (100)
5.257 (90)
7.31 (80)
3.021 (80)
3.353 (60)
6.905 (50)
5.944 (50)

Type Occurrence of EakeriteHide

General Appearance of Type Material:
Transparent prismatic crystals
Place of Conservation of Type Material:
Natural History Museum, London, England, 1968, 204.
National Museum of Natural History (Smithsonian), Washington, D.C., USA, 120301, 121143.
Geological Setting of Type Material:
Spodumene-rich pegmatite.
Leavens, P.B., White, J.S., Hey, M.H. (1970) Eakerite, a new tin silicate. The Mineralogical Record: 1: 92-96.

Synonyms of EakeriteHide

Other Language Names for EakeriteHide


Common AssociatesHide

Associated Minerals Based on Photo Data:
Pyrite1 photo of Eakerite associated with Pyrite on mindat.org.
Bavenite1 photo of Eakerite associated with Bavenite on mindat.org.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.14.1ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2OOrth.
16.14.2VinogradoviteNa4Ti4(Si2O6)2[(Si,Al)4O10]O4 · (H2O,Na,K)3Mon. 2/m : B2/b
16.14.3RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
16.14.4Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2 Mon.
16.14.6JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2OOrth.
16.14.8Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2OMon.
16.14.14WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
16.14.15MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
16.14.17BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6Trig. 3m (3 2/m) : P3 1m

Other InformationHide

Not soluble in acids or bases.
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 EakeriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Leavens, P.B., White, J.S., Hey, M.H. (1970) Eakerite, a new tin silicate. The Mineralogical Record: 1: 92-96.
Fleischer, M. (1971) New mineral names. American Mineralogist: 56: 631-640.
Kossiakoff, A.A., Leavens, P.B. (1976) The crystal structure of eakerite, a calcium-tin silicate. American Mineralogist: 61: 956-962.
Gaydukova, V.S., Grigor'yev, I.M., Dubinchuk, V.T., Il'yasov, A.M., Kuz'min, V.I., Sidorenko, G.A. (1982) Exsolution of stanniferous garnets. Doklady Akademii Nauk SSSR: 250: 151-153. (in Russian)
Uchida, H., Downs, R.T., Thompson, R.M. (2007) Reinvestigation of eakerite, Ca2SnAl2Si6O18(OH)2·2H2O: H-atom positions by single-crystal X-ray diffraction and correlation with Raman spectroscopic data. Acta Crystallographica: E63: i47-i49.

Internet Links for EakeriteHide

Localities for EakeriteHide

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.
  • Republic of Karelia
    • Ladoga Region
Ivashchenko, V. I., Valkama, M., Sundblad, K., Golubev, A. I., & Alekseev, V. Y. (2011, September). New data on mineralogy and metallogeny of scarns in the Pitkyaranta ore region. In Doklady Earth Sciences (Vol. 440, No. 1, pp. 1307-1311). SP MAIK Nauka/Interperiodica
        • Sortavala
No reference listed
  • North Carolina
    • Cleveland Co.
      • Kings Mountain District
Jan H.Bernard and Jaroslav Hyrsl,2004,Minerals and their Localities,pg #190; Rocks and Minerals, (1985) 60:76-82; Carolina Geological Society Field Trip Guidebook 1981, 39-48
Mineral and/or Locality  
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