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Boromullite Mineral Data

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General Boromullite Information

Help on Chemical  Formula: Chemical Formula: Al4.5SiB0.5O9.5
Help on Composition: Composition: Molecular Weight = 610.43 gm
   Magnesium   0.04 %  Mg    0.07 % MgO
   Aluminum   39.25 %  Al   74.16 % Al2O3
   Iron        0.27 %  Fe    0.35 % FeO
   Silicon     8.88 %  Si   19.00 % SiO2
   Boron       2.02 %  B     6.50 % B2O3
   Oxygen     49.54 %  O
             ______        ______ 
             100.00 %      100.08 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.01Fe2+0.03Al8.88Si1.93B1.14O18.9
Help on Environment: Environment: Formed during anatexis of B-rich pelitic rocks under granulite facies conditions. Structurally related to mullite.
Help on IMA Status: IMA Status: Approved IMA 2007 (Dana # Added)
Help on Locality: Locality: Mount Stafford, Northern Territory, Australia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the boron analog to mullite.
Help on Synonym: Synonym: IMA2007-021
 

Boromullite Image

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  Boromullite

Comments: PPL image of holotype boromullite prism in thin section 2006-MST22a. Bmu = boromullite, Crd = cordierite, Hc = hercynite, Kfs = K-feldspar, Sil = sillimanite. Eur. J. Mineral v20:935.
Location: Mount Stafford, central Australia. Scale: See Image.
© Eur. J. Mineral

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  Boromullite

Comments: BSE image of holotype boromullite prism in thin section 2006-MST22a. Bmu = boromullite, Crd = cordierite, Hc = hercynite, Kfs = K-feldspar, Sil = sillimanite. Eur. J. Mineral v20:935.
Location: Mount Stafford, central Australia. Scale: See Image.
© Eur. J. Mineral

Boromullite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3805:1:0.5108
Help on Cell Dimensions: Cell Dimensions: a = 5.7168, b = 15.023, c = 7.675, Z = 2; V = 659.16 Den(Calc)= 3.08
Help on Crystal System: Crystal System: Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: C mc21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.38(1), 1.512(0.8), 2.19(0.8),2.51(0.6), 2.67(0.6), 2.11(0.5), 5.37(0.5), 1.682(0.3),
 

Physical Properties of Boromullite

Help on Cleavage: Cleavage: None
Help on Color: Color: White.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Boromullite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2067,KC= 0.2078
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.627, b=1.634, g=1.649, bire=0.0220
 

Calculated Properties of Boromullite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Boromullite =3.08 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.008500053
Boson Index = 0.991499947
Help on Photoelectric: Photoelectric: PEBoromullite = 1.59 barns/electron
U=PEBoromullite x rElectron Density= 4.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Boromullite is Not Radioactive
 

Boromullite Classification

Help on  Dana Class: Dana Class: 52.02.02a.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02)with cations in [4] and >[4] coordination
  (52.02.02a)Al2SiO5 (Sillimanite subgroup)
 
52.02.02a.01 Sillimanite Al2SiO5=Al[6]Al[4]OSiO4 P nma 2/m 2/m 2/m
 
52.02.02a.02 Mullite Al(42x)Si(2-2x)O(10-x)wherex=0.17to0.59 Pbam 2/m 2/m 2/m
 
52.02.02a.03 Boromullite! Al4.5SiB0.5O9.5 C mc21 mm2
Help on  Strunz Class: Strunz Class: 09.AF.23 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AF -Nesosilicates with additional anions;
 
09.AF.23 Boromullite! Al4.5SiB0.5O9.5 C mc21 mm2
 

Other Boromullite Information

Help on References: References: NAME( AmMin, v94:648) PHYS. PROP.(AmMin, v94:648) OPTIC PROP.(AmMin, v94:648)
Help on See Also: See Also: Links to other databases for Boromullite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Boromullite

Al4.5SiB0.5O9.5
Dana No: 52.02.02a.03 Strunz No: 09.AF.23
Locality:

 

Notes:

 

 
   
 


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