Mineralogy Database

Eakerite Mineral Data

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General Eakerite Information

Help on Chemical  Formula: Chemical Formula: Ca2SnAl2Si6O18(OH)2•2(H2O)
Help on Composition: Composition: Molecular Weight = 779.38 gm
   Calcium   10.28 %  Ca   14.39 % CaO
   Aluminum   6.92 %  Al   13.08 % Al2O3
   Silicon   21.62 %  Si   46.26 % SiO2
   Tin       15.23 %  Sn   19.34 % SnO2
   Hydrogen   0.78 %  H     6.93 % H2O
   Oxygen    45.16 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca2SnAl2Si6O18(OH)2•2(H2O)
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in honor of Mr. Jack Eaker who was a mining engineer at the Foote lithium Company spodumene mine at King's Mountain, NC.
Help on Name Pronunciation: Name Pronunciation: Eakerite Say EAKERITE
Help on Synonym: Synonym: ICSD 12126
  PDF 24-218

Eakerite Image

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Comments: Transparent, prismatic crystal of eakerite.
Location: Foote mine, Kings Mountain, Cleveland County, North Carolina, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Eakerite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.0582:1:0.9633
Help on Cell Dimensions: Cell Dimensions: a = 15.892, b = 7.721, c = 7.438, Z = 2; beta = 101.32° V = 894.90 Den(Calc)= 2.89
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.812(1), 5.257(0.9), 7.31(0.8),

Physical Properties of Eakerite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.93
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Eakerite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2042,KPDmeas= 0.2014,KC= 0.2047
Ncalc = 1.59 - 1.6
Help on Optical Data: Optical Data: Biaxial (+), a=1.584, b=1.586, g=1.6, bire=0.0160, 2V(Calc)=42, 2V(Meas)=35.

Calculated Properties of Eakerite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.83 gm/cc
note: Specific Gravity of Eakerite =2.89 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEEakerite = 45.15 barns/electron
U=PEEakerite x rElectron Density= 127.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Eakerite is Not Radioactive

Eakerite Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.01)with 4-membered rings
  (72.01.05)Dana Group Eakerite Ca2SnAl2Si6O18(OH)2•2(H2O) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.CG.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CG -[Si4O12]8- Branched 4-membered single rings
09.CG.05 Eakerite Ca2SnAl2Si6O18(OH)2•2(H2O) P 21/a 2/m

Other Eakerite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Eakerite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.CG.05





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