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 IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Link to MinDat.org Location Data.
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 - PyramidalH-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),
Click Here for Large Chesterite Structure Window Crystal Structure:

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Veblen D R , Burnham C W , American Mineralogist , 63 (1978) p.1053-1073, New biopyriboles from Chester, Vermont: II. The crystal chemistry of, jimthompsonite, clinojimthompsonite, and chesterite, and the amphibole-mica, reaction

 

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 Diaphaniety: Diaphaniety: 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
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:

relectron=3.07 gm/cc
note: rChesterite =3.09 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.03022
Boson Index = 0.96978
Help on Photoelectric: Photoelectric:

PEChesterite = 4.73 barns/electron
U=PEChesterite x relectron= 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: 68.1.1.1 (68)Inosilicate Structures with Chains of More Than One Width
  (68.1)Dana Type
  (68.1.1)Dana Group
 
68.1.1.1 Chesterite (Mg,Fe)17Si20O54(OH)6 A21ma mm2
Help on Strunz Class: Strunz Class: VIII/F.13-10 VIII - Silicates
  VIII/F - Inosilicates (chain and band) double chains [Si4O11]6-, Orthorhombic Amphiboles
  VIII/F.13 - Amphibole group, Chesterite - Jimthomsonite series
 
VIII/F.13-10 Chesterite (Mg,Fe)17Si20O54(OH)6 A21ma mm2
 
VIII/F.13-20 Clinojimthompsonite (Mg,Fe)5Si6O16(OH)2 C 2/c 2/m
 
VIII/F.13-30 Jimthompsonite (Mg,Fe)5Si6O16(OH)2 P bca 2/m 2/m 2/m
 

Other Chesterite Information
Help on References: References: 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Print or Cut-and-Paste your Chesterite Specimen Label here :

Chesterite

(Mg,Fe++)17Si20O54(OH)6
Dana No: 68.1.1.1 Strunz No: VIII/F.13-10
Locality:

 

Notes:

 
 
   
 
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