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Chesterite

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Formula:
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
System:OrthorhombicHardness:2 - 2½
This page provides mineralogical data about Chesterite.

Classification of Chesterite

IMA status:Approved
Strunz 8th edition ID:8/F.13-10
Nickel-Strunz 10th (pending) edition ID:9.DF.05

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
Dana 8th edition ID:68.1.1.1

68 : INOSILICATES Structures with Chains of More Than One Width
1 : Structures with Chains of More Than One Width
Hey's CIM Ref.:14.21.10

14 : Silicates not Containing Aluminum
21 : Silicates of Fe and Mg
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Type Occurrence of Chesterite

Type Locality:Carlton Quarry (Carleton Talc Mine), Chester, Windsor Co., Vermont, USA
Year of Discovery:1977

Physical Properties of Chesterite

Hardness (Mohs):2 - 2½

Crystallography of Chesterite

Crystal System:Orthorhombic
Cell Parameters:a = 18.61Å, b = 45.3Å, c = 5.29Å
Ratio:a:b:c = 0.411 : 1 : 0.117
Unit Cell Volume:V 4,459.64 ų (Calculated from Unit Cell)

Optical Data of Chesterite

Type:Biaxial (-)
RI values: nα = 1.617 nβ = 1.632 nγ = 1.640
2V:Measured: 71° , Calculated: 70°
Maximum Birefringence:δ = 0.023

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:r < v

Chemical Properties of Chesterite

Formula:
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
Essential elements:H, Mg, O, Si
All elements listed in formula:Fe, H, Mg, O, Si
Common Impurities:Al,Mn,Ca,Na

Relationship of Chesterite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DF.05Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.05Jimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.15Ershovite
Na
 
4
K
 
3
(Fe,Mn,Ti)
 
2
Si
 
8
O
 
22
(OH)
 
4
 · 4H
 
2
O
9.DF.15Paraershovite
Na
 
3
K
 
3
Fe
3+
2
Si
 
8
O
 
20
(OH)
 
4
 · 4H
 
2
O
9.DF.20Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
 · 3H
 
2
O
9.DF.25Bavenite
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
9.DF.30Bigcreekite
BaSi
 
2
O
 
5
 · 4H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.21.1Olivine
(Mg,Fe
2+
 
)
 
2
SiO
 
4
14.21.2Ringwoodite
(Mg,Fe
2+
 
)
 
2
SiO
 
4
14.21.3Wadsleyite
(Mg,Fe
2+
 
)
 
2
(SiO
 
4
)
14.21.4Clinoferrosilite
Fe
2+
 
SiO
 
3
14.21.5Anthophyllite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.6Cummingtonite
☐{Mg
 
2
}{Mg
 
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.7 Magnesiocummingtonite
14.21.8Grunerite
☐{Fe
2+
2
}{Fe
2+
5
}(Si
 
8
O
 
22
)(OH)
 
2
14.21.9Minnesotaite
(Fe,Mg)
 
3
(Si
 
4
O
 
10
)(OH)
 
2
14.21.11Jimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
14.21.12Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
14.21.13Majorite
Mg
 
3
(Fe
2+
 
,Si,Al)
 
2
(SiO
 
4
)
 
3
14.21.14Balangeroite
(Mg,Fe
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40

Other Names for Chesterite

Synonyms:
IMA1977-010
Other Languages:
German:Chesterit
Russian:Честерит
Spanish:Chesterita

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 Chesterite

Reference List:

- +
American Mineralogist: 63: 1000-1009., 1053-1073.

Internet Links for Chesterite

Search Engines:
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    • External Links:
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  • Look for Chesterite on Wikipedia
  • Look for Chesterite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chesterite details from Handbook of Mineralogy (PDF)
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    • Localities for Chesterite

    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.
    Hide Locality List
    (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.
    Greenland
     
    • Kitaa (West Greenland) Province
      • Nuuk (Godthåb)
    		http://epsc.wustl.edu/admin/whatsnew/photo_album/week/pw2006-12-06.htm
    Japan
     
    • Honshu Island
      • Tohoku Region
        • Iwate Prefecture
          • Kitakami Mts
    		Konishi, et al (1991) Abstract of the Meeting of the Mineralogical Society of Japan, 101.
    Switzerland
     
    • Ticino (Tessin)
      • Maggia Valley
        • Lavizzara Valley
          • Fusio
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
    Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229-230.
      • Verzasca Valley
    		Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 229.
    UK
     
    • Scotland
      • North West Highlands (Sutherland)
    		Droop, G.T.R. (1994) Triple-chain pyriboles in Lewisian ultramafic rocks. Mineralogical Magazine, 58, 11, 1-20.
    USA
     
    • Montana
    		http://webmineral.com/data/Chesterite.shtml
    • Vermont
      • Windsor Co.
        • Chester
    		Rocks & Min. Vol. 71, (1996)
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