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

Images:

Eakerite

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

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 - Prismatic H-M Symbol (2/m) Space Group: P 2₁/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.812(1), 5.257(0.9), 7.31(0.8),

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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Print or Cut-and-Paste your Eakerite Specimen Label here :

Eakerite

Ca2SnAl2Si6O18(OH)2•2(H2O)
Dana No: 72.01.05.01 Strunz No: 09.CG.05
Locality:

Notes:

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