Mineralogy Database

Magnesiodumortierite Mineral Data

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General Magnesiodumortierite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Ti,[ ])<1(Al,Mg)2Al4Si3O18-y(OH)yB y=2-3
Help on Composition: Composition: Molecular Weight = 572.14 gm
   Magnesium   4.25 %  Mg    7.04 % MgO
   Titanium    2.51 %  Ti    4.19 % TiO2
   Aluminum   25.94 %  Al   49.01 % Al2O3
   Silicon    14.73 %  Si   31.51 % SiO2
   Boron       1.89 %  B     6.08 % B2O3
   Hydrogen    0.35 %  H     3.15 % H2O
   Oxygen     50.34 %  O
             ______        ______ 
             100.00 %      100.98 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgTi0.3Al5.5Si3O16B(OH)2
Help on Environment: Environment: In pyrope megablasts which occur in coesite bearing quartz-phengite-kyanite schists.
Help on IMA Status: IMA Status: Approved IMA 1995
Help on Locality: Locality: Dor-Maira massif, western Alps, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For its containing magnesium and the relationship to dumortierite.
Help on Synonym: Synonym: ICSD 79840
  PDF 47-1876

Magnesiodumortierite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5832:1:0.2308
Help on Cell Dimensions: Cell Dimensions: a = 11.91, b = 20.42, c = 4.714, Z = 4; V = 1,146.46 Den(Calc)= 3.31
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.246(1), 2.105(0.9), 5.91(0.9),

Physical Properties of Magnesiodumortierite

Help on Cleavage: Cleavage: {001} Poor
Help on Color: Color: Pinkish red, Red.
Help on Density: Density: 3.22
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Magnesiodumortierite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2094,KPDmeas= 0.2152,KC= 0.2213
Ncalc = 1.71 - 1.73
Help on Optical Data: Optical Data: Biaxial (-), a=1.678, b=1.7, g=1.701, bire=0.0230, 2V(Calc)=22, 2V(Meas)=38.5.
Help on Pleochroism (x): Pleochroism (x): red or pale pink.
Help on Pleochroism (y): Pleochroism (y): colorless or colorless.
Help on Pleochroism (z): Pleochroism (z): colorless or colorless.

Calculated Properties of Magnesiodumortierite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Magnesiodumortierite =3.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMagnesiodumortierite = 1.85 barns/electron
U=PEMagnesiodumortierite x rElectron Density= 5.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Magnesiodumortierite is Not Radioactive

Magnesiodumortierite Classification

Help on  Dana Class: Dana Class: (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.01)with (BO3)
  (54.01.02)Dumortierite group Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.AJ.10 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,
09.AJ.10 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m
09.AJ.10 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m
09.AJ.10 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

Other Magnesiodumortierite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Magnesiodumortierite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Diederik Visser
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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


(Mg,Ti,[ ])<1(Al,Mg)2Al4Si3O18-y(OH)yB y=2-3
Dana No: Strunz No: 09.AJ.10





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