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Chloritoid Mineral Data

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General Chloritoid Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg,Mn)2Al4Si2O10(OH)4
Help on Composition: Composition: Molecular Weight = 484.71 gm
   Magnesium   3.01 %  Mg    4.99 % MgO
   Manganese   2.27 %  Mn    2.93 % MnO
   Aluminum   22.27 %  Al   42.07 % Al2O3
   Iron       13.83 %  Fe   17.79 % FeO
   Silicon    11.59 %  Si   24.79 % SiO2
   Hydrogen    0.83 %  H     7.43 % H2O
   Oxygen     46.21 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.2Mg0.6Mn2+0.2Al4Si2O10(OH)4
Help on Environment: Environment: Metamorphic phyllites, schists and marbles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1837
Help on Locality: Locality: Saas and Lukmanier, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its resemblance to chlorite minerals.
Help on Synonym: Synonym: Sismondine(Mg)

Chloritoid Image

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  Chloritoid   Paragonite

Comments: Grayish crystalline inclusion of chloritoid in white, massive paragonite.
Location: Drandorf Fundgrube Mine, Bockau, Schwarzenberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Chloritoid Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7335:1:1.6715
Help on Cell Dimensions: Cell Dimensions: a = 9.5, b = 5.48, c = 9.16, Z = 2; alpha = 96.88°, beta = 101.8°, gamma = 90.03° V = 463.43 Den(Calc)= 3.47
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.47(1), 2.46(0.9), 2.97(0.8),

Physical Properties of Chloritoid

Help on Cleavage: Cleavage: {???} Imperfect
Help on Color: Color: Green gray, Green black, Grayish black, Dark green, Dark gray.
Help on Density: Density: 3.52 - 3.57, Average = 3.54
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: colorless green gray

Optical Properties of Chloritoid

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.038 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2049,KC= 0.2131
Ncalc = 1.74 - 1.76
Help on Optical Data: Optical Data: Biaxial (+), a=1.713-1.73, b=1.719-1.734, g=1.723-1.74, bire=0.0100, 2V(Calc)=78-80, 2V(Meas)=36-89. Dispersion r > v.
Help on Pleochroism (x): Pleochroism (x): greenish gray, olive green, colorless, or greenish blue.
Help on Pleochroism (y): Pleochroism (y): bluish gray, indigo, or bluish green.

Calculated Properties of Chloritoid

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.43 gm/cc
note: Specific Gravity of Chloritoid =3.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChloritoid = 5.82 barns/electron
U=PEChloritoid x rElectron Density= 19.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chloritoid is Not Radioactive

Chloritoid Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.03)with cations in [6] coordination only
  (52.03.03)Chloritoid group Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1
Help on  Strunz Class: Strunz Class: 09.AF.85 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
09.AF.85 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1
09.AF.85 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m
09.AF.85 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

Other Chloritoid Information

Help on See Also: See Also: Links to other databases for Chloritoid :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Franklin Minerals(Dunn)
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Minerals in Thin Section-University of North Carolina
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - UCLA - Petrography Thin-Sections

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Dana No: Strunz No: 09.AF.85





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