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Eakerite

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Formula:
Ca2SnAl2Si6O18(OH)2 · 2H2O
System:
Monoclinic
Colour:
Colourless, white
Hardness:
Name:
For Jack Eaker, mining engineer.
This page provides mineralogical data about Eakerite.

Classification of Eakerite

Approved 1969
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
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Type Occurrence of Eakerite

Year of Discovery:
1969

Physical Properties of Eakerite

Colour:
Colourless, white
Hardness (Mohs):

Crystallography of Eakerite

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

Optical Data of Eakerite

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 Eakerite

Formula:
Ca2SnAl2Si6O18(OH)2 · 2H2O
Essential elements:
All elements listed in formula:

Relationship of Eakerite to other Species

16.14.1ZoriteNa8(Ti,Nb)5(Si6O17)2(OH,O)5 · 14H2O
16.14.2Vinogradovite(Na,Ca,K)4Ti4AlSi6O23(OH) · 2H2O
16.14.3RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]
16.14.4Kaersutite{Na}{Ca2}{Mg3AlTi}(Al2Si6O22)O2
16.14.5Ferro-kaersutite{Na}{Ca2}{Fe32+AlTi}(Al2Si6O22)O2
16.14.6JonesiteBa4(K,Na)2Ti4Al2(Si3O9)2(SiO4)4O2 · 6H2O
16.14.7Lourenswalsite(K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12
16.14.8Labuntsovite-MnNa4K4(Ba,K)2Mn2+(Ti,Nb)8(Si4O12)4(O,OH)8 · 10-12H2O
16.14.9KimzeyiteCa3(Zr,Ti)2((Si,Al,Fe3+)O4)3
16.14.10EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
16.14.11Carlosturanite(Mg,Fe,Ti)21(Si,Al)12O28(OH)34•H2O
16.14.13PlumalsitePb4Al2(SiO3)7
16.14.14WickenburgiteCaPb3Al2Si10O24(OH)6
16.14.15MaricopaitePb7Ca2(Si,Al)48O100 · 32H2O
16.14.16Epidote-(Pb){CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
16.14.17BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
16.14.18MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6

Other Names for Eakerite

Name in Other Languages:
German:Eakerit
Russian:Экерит
Spanish:Eakerita

Other Information

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 Eakerite

Reference List:
American Mineralogist: 56: 637.

American Mineralogist: 61: 956-962.

Internet Links for Eakerite

Localities for Eakerite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
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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