Eakerite Mineral Data

General Eakerite Information

Chemical Formula: Ca2SnAl2Si6O18(OH)2•2(H2O) 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 Empirical Formula: Ca₂SnAl₂Si₆O₁₈(OH)₂•2(H₂O) IMA Status: Approved IMA 1970 Locality: Link to MinDat.org Location Data. 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. Name Pronunciation: Eakerite Synonym: ICSD 12126   PDF 24-218  

Eakerite Image

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Eakerite Crystallography

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

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Kossiakoff A A , Leavens P B , American Mineralogist , 61 (1976) p.956-962, The crystal structure of eakerite, a calcium-tin silicate

 

Physical Properties of Eakerite

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

Optical Properties of Eakerite

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 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

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

Eakerite Classification

Dana Class: 72.01.05.01 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings   (72.01)with 4-membered rings   (72.01.05)Dana Group  

72.01.05.01 Eakerite Ca2SnAl2Si6O18(OH)2•2(H2O) P 2₁/a 2/m

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

References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) 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
15 - WWW-MINCRYST
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