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Eakerite

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About EakeriteHide

Formula:
Ca2SnAl2Si6O18(OH)2 · 2H2O
Colour:
Colourless, white
Hardness:
Specific Gravity:
2.93
Crystal System:
Monoclinic
Name:
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

Approved
Approval Year:
1969
First Published:
1970
9.CG.05

9 : SILICATES (Germanates)
C : Cyclosilicates
G : [Si4O12]8- branched 4-membered single rings
72.1.5.1

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
16.14.12

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

Physical Properties of EakeriteHide

Transparency:
Transparent
Colour:
Colourless, white
Hardness:
5½ on Mohs scale
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
2.93(1) g/cm3 (Measured)    2.931 g/cm3 (Calculated)
Comment:
Measured flawless crystals by immersion in Clerici solution

Optical Data of EakeriteHide

Type:
Biaxial (+)
RI values:
nα = 1.584 nβ = 1.586 nγ = 1.600
2V:
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:
Moderate
Dispersion:
small

Chemical Properties of EakeriteHide

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

Crystallography of EakeriteHide

Crystal System:
Monoclinic
Cell Parameters:
a = 15.83 Å, b = 7.72 Å, c = 7.44 Å
β = 101.31°
Ratio:
a:b:c = 2.051 : 1 : 0.964
Unit Cell V:
891.57 ų (Calculated from Unit Cell)
Morphology:
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:
d-spacingIntensity
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.
Reference:
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

German:Eakerit
Russian:Экерит
Spanish:Eakerita

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.
16.14.5Ferro-kaersutite{Na}{Ca2}{Fe2+3AlTi}(Al2Si6O22)O2Mon.
16.14.6JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2OOrth.
16.14.7Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12Hex.
16.14.8Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2OMon.
16.14.9KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3Iso.
16.14.10EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10Hex.
16.14.11Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2OMon.
16.14.13PlumalsitePb4Al2(SiO3)7
16.14.14WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
16.14.15MaricopaitePb7Ca2(Si,Al)48O100 · 32H2OOrth.
16.14.16Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)Mon.
16.14.17BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6Trig. 3m (3 2/m) : P3 1m
16.14.18MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6Trig.

Other InformationHide

Notes:
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.
Russia
 
  • Northern Region
    • Karelia Republic
      • 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
USA (TL)
 
  • 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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