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Chesterite

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Formula:
(Mg,Fe)17Si20O54(OH)6
Colour:
colorless to very light pinkish brown
Hardness:
2 - 2½
Crystal System:
Orthorhombic
Name:
Named for the town of Chester, Vermont, near the type locality.
This page provides mineralogical data about Chesterite.


Hide all sections | Show all sections

Classification of ChesteriteHide

Approved
Approval Year:
1977
First Published:
1978
Approval History:
IMA1977-010
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

Physical Properties of ChesteriteHide

Transparency:
Transparent
Colour:
colorless to very light pinkish brown
Comment:
colorless in thin section
Hardness:
2 - 2½ on Mohs scale
Cleavage:
Perfect
{110}

Optical Data of ChesteriteHide

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 ChesteriteHide

Formula:
(Mg,Fe)17Si20O54(OH)6
IMA Formula:
Mg17Si20O54(OH)6
Common Impurities:
Al,Mn,Ca,Na

Crystallography of ChesteriteHide

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

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.327 (41)
8.609 (100)
3.751 (34)
3.246 (49)
3.076 (66)
2.779 (31)
2.554 (36)

Type Occurrence of ChesteriteHide

General Appearance of Type Material:
Intergrowths in anthophyllite and cummingtonite. Radiating sprays of prismatic crystals to 5 cm.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada, M36083.
Harvard University, Cambridge, Massachusetts, 134079.
National Museum of Natural History, Washington, D.C., USA, 145869.
Geological Setting of Type Material:
'Blackwall zone' or the chlorite- or biotite-bearing metasomatic reaction zone sometimes found at the boundary of a metamorphosed ultramafic body.
Reference:
Veblen, D.R., Burnham, C.W. (1978) New biopyriboles from Chester, Vermont: I. Descriptive mineralogy. American Mineralogist: 63: 1000-1009.

Synonyms of ChesteriteHide

Other Language Names for ChesteriteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Jimthompsonite2 photos of Chesterite associated with Jimthompsonite on mindat.org.
Clinojimthompsonite2 photos of Chesterite associated with Clinojimthompsonite on mindat.org.
Talc1 photo of Chesterite associated with Talc on mindat.org.
Anthophyllite1 photo of Chesterite associated with Anthophyllite on mindat.org.
Magnetite1 photo of Chesterite associated with Magnetite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric.
9.DF.15ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
9.DF.30BigcreekiteBaSi2O5 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.21.1OlivineOrth.
14.21.2Ringwoodite(Mg,Fe2+)2SiO4Iso. m3m (4/m 3 2/m) : Ia3d
14.21.3Wadsleyite(Mg,Fe2+)2(SiO4)Orth.
14.21.4ClinoferrosiliteFe2+SiO3Mon.
14.21.5Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
14.21.6Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2Mon.
14.21.7 Magnesiocummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
14.21.8Grunerite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Mon. 2/m : B2/m
14.21.9MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
14.21.11Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
14.21.12Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
14.21.13MajoriteMg3(Fe2+,Si,Al)2(SiO4)3Iso.
14.21.14Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.

Other InformationHide

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 ChesteriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Veblen, D.R., Burnham, C.W. (1978) New biopyriboles from Chester, Vermont: I. Descriptive mineralogy. American Mineralogist: 63: 1000-1009.
Veblen, D.R., Burnham, C.W. (1978) New biopyriboles from Chester, Vermont: II. The crystal chemistry of jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica reaction. American Mineralogist: 63: 1053-1073.

Internet Links for ChesteriteHide

Localities for ChesteriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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
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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