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Chesterite Mineral Data

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General Chesterite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)17Si20O54(OH)6
Help on Composition: Composition: Molecular Weight = 2,074.96 gm
   Magnesium  14.93 %  Mg   24.77 % MgO
   Iron       11.44 %  Fe   14.72 % FeO
   Silicon    27.07 %  Si   57.91 % SiO2
   Hydrogen    0.29 %  H     2.60 % H2O
   Oxygen     46.26 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg12.75Fe2+4.25Si20O54(OH)6
Help on Environment: Environment: In black wallrock between chlorite and actinolite zones of a metamorphosed ultramafic body.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: In the Carleton talc quarry, near Chester, Windsor Co., Vermont, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 100659
  PDF 31-637

Chesterite Image

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  Chesterite   Magnetite

Comments: Green platy chesterite in black, metallic magnetite.
Location: Near Missoula, Missoula County, Montana, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chesterite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4108:1:0.1169
Help on Cell Dimensions: Cell Dimensions: a = 18.614, b = 45.306, c = 5.2966, Z = 4; V = 4,466.76 Den(Calc)= 3.09
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: A21ma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.609(1), 3.076(0.66), 3.246(0.49),

Physical Properties of Chesterite

Help on Cleavage: Cleavage: {110} Perfect
Help on Color: Color: Colorless, Pink brown.
Help on Density: Density: 3.23
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Silky - Pearly
Help on Streak: Streak: white

Optical Properties of Chesterite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.056 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.013 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2038,KPDmeas= 0.1949,KC= 0.2065
Ncalc = 1.64 - 1.67
Help on Optical Data: Optical Data: Biaxial (-), a=1.617, b=1.632, g=1.64, bire=0.0230, 2V(Calc)=70, 2V(Meas)=71.

Calculated Properties of Chesterite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.07 gm/cc
note: Specific Gravity of Chesterite =3.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEChesterite = 4.73 barns/electron
U=PEChesterite x rElectron Density= 14.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chesterite is Not Radioactive

Chesterite Classification

Help on  Dana Class: Dana Class: (68)Inosilicate Structures with Chains of More Than One Width
  (68.01)Dana Type
  (68.01.01)Dana Group Chesterite (Mg,Fe)17Si20O54(OH)6 A21ma mm2
Help on  Strunz Class: Strunz Class: 09.DF.05 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DF -Inosilicates with 2-periodic multiple chains
09.DF.05 Chesterite (Mg,Fe)17Si20O54(OH)6 A21ma mm2
09.DF.05 Clinojimthompsonite (Mg,Fe)5Si6O16(OH)2 C 2/c 2/m
09.DF.05 Jimthompsonite (Mg,Fe)5Si6O16(OH)2 P bca 2/m 2/m 2/m

Other Chesterite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Chesterite :
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

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Dana No: Strunz No: 09.DF.05





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