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Eakerite

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Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
© JBS 2006

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Formula:
Ca
 
2
SnAl
 
2
Si
 
6
O
 
18
(OH)
 
2
·2H
 
2
O
System:MonoclinicColour:Colourless, white
Hardness:5½
Name:For Jack Eaker, mining engineer.
This page provides mineralogical data about Eakerite.

Classification of Eakerite

IMA status:Approved 1969
Strunz 8th edition ID:8/G.02-10
Nickel-Strunz 10th (pending) edition ID:9.CG.05

9 : SILICATES (Germanates)
C : Cyclosilicates
G : [Si4O12]8- branched 4-membered single rings
Dana 8th edition ID: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
Hey's CIM Ref.: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

Type Locality:Foote Lithium Co. Mine (Foote Mine), Kings Mountain District, Cleveland Co., North Carolina, USA
Year of Discovery:1970

Physical Properties of Eakerite

Colour:Colourless, white
Hardness (Mohs):5½

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°
Maximum Birefringence:δ = 0.016

Chart 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:
Ca
 
2
SnAl
 
2
Si
 
6
O
 
18
(OH)
 
2
·2H
 
2
O
Essential elements:Al, Ca, H, O, Si, Sn
All elements listed in formula:Al, Ca, H, O, Si, Sn

Relationship of Eakerite to other Species

Related Minerals - Hey's Index Grouping:

- +
16.14.1Zorite
Na
 
2
Ti(Si,Al)
 
3
O
 
9
·nH
 
2
O
16.14.2Vinogradovite
(Na,Ca,K)
 
4
Ti
 
4
AlSi
 
6
O
 
23
(OH)·2H
 
2
O
16.14.3Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
16.14.4Kaersutite
[Na][Ca
 
2
][Mg
 
4
Ti][O|OH|Al
 
2
Si
 
6
O
 
22
]
16.14.5Ferrokaersutite
[Na][Ca
 
2
][Fe
2+
4
Ti][O|OH|Al
 
2
Si
 
6
O
 
22
]
16.14.6Jonesite
Ba
 
4
(K,Na)
 
2
Ti
 
4
Al
 
2
[O|(SiO
 
4
)
 
2
|Si
 
3
O
 
9
]
 
2
 · 6H
 
2
O
16.14.7Lourenswalsite
(K,Ba)
 
2
(Ti,Mg,Ca,Fe)
 
4
(Si,Al,Fe)
 
6
O
 
14
(OH)
 
12
16.14.8Labuntsovite-Mn
Na
 
4
K
 
4
(Ba,K)
 
2
Mn
2+
 
(Ti,Nb)
 
8
[(O,OH)
 
2
|Si
 
4
O
 
12
]
 
4
 · 10-12H
 
2
O
16.14.9Kimzeyite
Ca
 
3
(Zr,Ti)
 
2
[(Si,Al,Fe
3+
 
)O
 
4
]
 
3
16.14.10Ellenbergerite
Mg
 
6
Al
 
6
Ti[(OH)
 
6
|(HSiO
 
4
)
 
4
|(SiO
 
4
)
 
4
]
16.14.11Carlosturanite
(Mg,Fe,Ti)
 
21
(Si,Al)
 
12
O
 
28
(OH)
 
34
16.14.13Plumalsite
Pb
 
4
Al
 
2
(SiO
 
3
)
 
7
16.14.14Wickenburgite
CaPb
 
3
Al
 
2
Si
 
10
O
 
24
(OH)
 
6
16.14.15Maricopaite
Pb
 
7
Ca
 
2
(Si,Al)
 
48
O
 
100
·32H
 
2
O
16.14.16Epidote-(Pb)
{CaPb}{Al
 
3
}[O|OH|SiO
 
4
|Si
 
2
O
 
7
]
16.14.17Burckhardtite
Pb
 
2
(Fe,Mn)AlTeO
 
2
Si
 
3
O
 
10
(OH)
 
2
·H
 
2
O
16.14.18Mathewrogersite
Pb
 
7
(Fe
2+
 
,Cu)Al
 
3
Ge[(OH,H
 
2
O)
 
6
|(Si
 
3
O
 
9
)
 
4
]

Other Names for Eakerite

Synonyms:
IMA1969-019
Other Languages:
German:Eakerit
Russian:Экерит
Spanish:Eakerita

Other Information

Health Warning: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

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  • Raman and XRD data at RRUFF project
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    Localities for Eakerite

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    The 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. ? 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
          • Pitkyaranta (Pitkäranta) District
            • Sortavala
    		No reference listed
    USA
     
    • North Carolina
      • Cleveland Co.
        • Kings Mountain District
    		Jan H.Bernard and Jaroslav Hyrsl,2004,Minerals and their Localities,pg #190
    Mineral and/or Locality
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