Mineralogy Database

Magnesiochloritoid Mineral Data

Search Webmineral :

General Magnesiochloritoid Information

Help on Chemical  Formula: Chemical Formula: MgAl2SiO5(OH)2
Help on Composition: Composition: Molecular Weight = 220.37 gm
   Magnesium  11.03 %  Mg   18.29 % MgO
   Aluminum   24.49 %  Al   46.27 % Al2O3
   Silicon    12.74 %  Si   27.27 % SiO2
   Hydrogen    0.91 %  H     8.18 % H2O
   Oxygen     50.82 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgAl2SiO5(OH)2
Help on Environment: Environment: In metapelites and related rocks within high-grade blueschist rocks; stable under metamorphic conditions of near 500 �C and 18 kbar.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Monte Rosa massif, near the Ghiacciaio di Verra; in the Val d'Ayas, Italy, near the border with Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for magnesium in its composition and its relation to chloritoid.
Help on Synonym: Synonym: Sismondine

Magnesiochloritoid Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7291:1:3.3233
Help on Cell Dimensions: Cell Dimensions: a = 9.46, b = 5.471, c = 18.182, Z = 9; beta = 101.4° V = 922.46 Den(Calc)= 3.57
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): 4.47(1), 2.46(0.9), 2.97(0.8),

Physical Properties of Magnesiochloritoid

Help on Cleavage: Cleavage: {001} Perfect, {110} Distinct
Help on Color: Color: Greenish gray, Greenish black.
Help on Density: Density: 3.5 - 3.6, Average = 3.55
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Pearly
Help on Streak: Streak: gray white

Optical Properties of Magnesiochloritoid

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.065 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2017,KPDmeas= 0.2028,KC= 0.2169
Ncalc = 1.76 - 1.78
Help on Optical Data: Optical Data: Biaxial (?), b=1.72

Calculated Properties of Magnesiochloritoid

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.54 gm/cc
note: Specific Gravity of Magnesiochloritoid =3.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMagnesiochloritoid = 1.47 barns/electron
U=PEMagnesiochloritoid x rElectron Density= 5.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiochloritoid is Not Radioactive

Magnesiochloritoid 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 Magnesiochloritoid 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 Magnesiochloritoid :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

Search for Magnesiochloritoid using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Magnesiochloritoid :

Ask about Magnesiochloritoid here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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


Dana No: Strunz No: 09.AF.85





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.