Magnesiochloritoid Mineral Data

Magnesiochloritoid Mineral Data

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General Magnesiochloritoid Information

Chemical Formula:

MgAl2SiO5(OH)2

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

Empirical Formula:

MgAl₂SiO₅(OH)₂

IMA Status:

Approved IMA 1983

Locality:

Link to MinDat.org Location Data.

Synonym:

Sismondine

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Magnesiochloritoid Crystallography

Axial Ratios:

a:b:c =1.7291:1:3.3233

Cell Dimensions:

a = 9.46, b = 5.471, c = 18.182, Z = 9; beta = 101.4° V = 922.46 Den(Calc)= 3.57

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.47(1), 2.46(0.9), 2.97(0.8),

Crystal Structure:

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Ivaldi G , Catti M , Ferraris G , American Mineralogist , 73 (1988) p.358-364, Crystal structure at 25 and 700 C of magnesiochloritoid from a high-pressure, assemblage (Monte Rosa), Sample at 25 C

View Additional jPOWD Structure files for Magnesiochloritoid
[1] [2] [3] [4]

Physical Properties of Magnesiochloritoid

Cleavage:

[001] Perfect, [110] Distinct

Color:

Greenish gray, Greenish black.

Density:

3.5 - 3.6, Average = 3.55

Diaphaniety:

Translucent

Hardness:

6.5 - Pyrite

Luster:

Pearly

Streak:

gray white

Optical Properties of Magnesiochloritoid

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

Optical Data:

Biaxial (?), b=1.72

Calculated Properties of Magnesiochloritoid

Electron Density:

r_electron=3.54 gm/cc
note: r_{Magnesiochloritoid}=3.55 gm/cc.

Fermion Index

Fermion Index = 0.01722
Boson Index = 0.98278

Photoelectric:

PE_{Magnesiochloritoid}= 1.47 barns/electron
U=PE_{Magnesiochloritoid} x r_electron= 5.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Magnesiochloritoid is Not Radioactive

Magnesiochloritoid Classification

Dana Class:

52.3.3.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.3)with cations in [6] coordination only

(52.3.3)Chloritoid group

52.3.3.1 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1

52.3.3.2 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m

52.3.3.3 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

52.3.3.4 Carboirite-VIII Fe(Al,Ge)2O[(Ge,Si)O4](OH)2 C1 1

Strunz Class:

VIII/B.24-10 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.24 - Magnesiochloritoid - Ottrelite series

VIII/B.24-10 Magnesiochloritoid MgAl2SiO5(OH)2 C 2/c 2/m

VIII/B.24-20 Chloritoid (Fe,Mg,Mn)2Al4Si2O10(OH)4 P1 1

VIII/B.24-30 Ottrelite (Mn,Fe,Mg)2Al4Si2O10(OH)4 C 2/c 2/m

Other Magnesiochloritoid Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Magnesiochloritoid :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (MinSocAm) 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST

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

Magnesiochloritoid

MgAl2SiO5(OH)2
Dana No: 52.3.3.2 Strunz No: VIII/B.24-10
Locality:

Notes: