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Chesterite

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Formula:
(Mg,Fe)17Si20O54(OH)6
System:
Orthorhombic
Hardness:
2 - 2½
This page provides mineralogical data about Chesterite.

Classification of Chesterite

Approved
9.DF.05

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
68.1.1.1

68 : INOSILICATES Structures with Chains of More Than One Width
1 : Structures with Chains of More Than One Width
14.21.10

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

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°
Max Birefringence:
δ = 0.023
Image 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)17Si20O54(OH)6
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Mn,Ca,Na

Relationship of Chesterite to other Species

9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O
9.DF.15ParaershoviteNa3K3Fe23+Si8O20(OH)4 · 4H2O
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2O
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2
9.DF.30BigcreekiteBaSi2O5 · 4H2O
14.21.1Olivine(Mg,Fe2+)2SiO4
14.21.2Ringwoodite(Mg,Fe2+)2SiO4
14.21.3Wadsleyite(Mg,Fe2+)2(SiO4)
14.21.4ClinoferrosiliteFe2+SiO3
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.6Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.7 Magnesiocummingtonite
14.21.8Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
14.21.9Minnesotaite(Fe,Mg)3(Si4O10)(OH)2
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2
14.21.12Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2
14.21.13MajoriteMg3(Fe2+,Si,Al)2(SiO4)3
14.21.14Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40

Other Names for Chesterite

Name in Other Languages:

Other Information

Health Risks:
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

Localities for Chesterite

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 for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Finland
 
  • Southwestern Finland Region
    • Salo
      • Kisko
Schumacher, J. & Czank, M. 1987. Mineralogy of triple- and double-chain pyriboles from Orijärvi, southwest Finland. The American Mineralogist 72 ( 3-4) 345-352.
Greenland
 
  • Sermersooq
    • 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)
Mineral and/or Locality  
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