Mineralogy Database

Clinojimthompsonite Mineral Data

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General Clinojimthompsonite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)5Si6O16(OH)2
Help on Composition: Composition: Molecular Weight = 619.47 gm
   Magnesium  14.71 %  Mg   24.40 % MgO
   Iron       11.27 %  Fe   14.50 % FeO
   Silicon    27.20 %  Si   58.20 % SiO2
   Hydrogen    0.33 %  H     2.91 % H2O
   Oxygen     46.49 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg3.75Fe2+1.25Si6O16(OH)2
Help on Environment: Environment: In the 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 its monoclinic crystallography and relation to jimthompsonite
Help on Synonym: Synonym: ICSD 100658
  PDF 31-639

Clinojimthompsonite Image

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  Clinojimthompsonite   Jimthompsonite

Comments: Pale green to white glassy crystalline fibrous clinojimthompsonite intergrown with jimthompsonite.
Location: Chester, Windsor County, Vermont, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Clinojimthompsonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3624:1:0.1951
Help on Cell Dimensions: Cell Dimensions: a = 9.874, b = 27.24, c = 5.316, Z = 4; beta = 109.47° V = 1,348.07 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.809(1), 13.6(0.73), 3.083(0.6),

Physical Properties of Clinojimthompsonite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Colorless, Pink brown.
Help on Density: Density: 3.02
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Silky - Pearly
Help on Streak: Streak: white

Optical Properties of Clinojimthompsonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.001 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2047,KPDmeas= 0.2067,KC= 0.207
Ncalc = 1.63
Help on Optical Data: Optical Data: Biaxial (-), a=1.61, b=1.63, g=1.633, bire=0.0230, 2V(Calc)=40, 2V(Meas)=65.

Calculated Properties of Clinojimthompsonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Clinojimthompsonite =3.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEClinojimthompsonite = 4.68 barns/electron
U=PEClinojimthompsonite x rElectron Density= 14.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Clinojimthompsonite is Not Radioactive

Clinojimthompsonite Classification

Help on  Dana Class: Dana Class: (67)Inosilicate Unbranched Chains with W>2
  (67.01)with W=3
  (67.01.01)Jimthompsonite group Jimthompsonite (Mg,Fe)5Si6O16(OH)2 P bca 2/m 2/m 2/m Clinojimthompsonite (Mg,Fe)5Si6O16(OH)2 C 2/c 2/m
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 Clinojimthompsonite 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 Clinojimthompsonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Ecole des Mines de Paris
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Dana No: Strunz No: 09.DF.05





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