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Boromullite Mineral Data
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General Boromullite Information
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 Chemical Formula: |
Al4.5SiB0.5O9.5 |
| Composition: |
Molecular Weight = 610.43 gm |
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Magnesium 0.04 % Mg 0.07 % MgO |
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Aluminum 39.25 % Al 74.16 % Al2O3 |
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Iron 0.27 % Fe 0.35 % FeO |
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Silicon 8.88 % Si 19.00 % SiO2 |
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Boron 2.02 % B 6.50 % B2O3 |
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Oxygen 49.54 % O |
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______ ______ |
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100.00 % 100.08 % = TOTAL OXIDE |
| Empirical Formula: |
Mg0.01Fe2+0.03Al8.88Si1.93B1.14O18.9 |
| Environment: |
Formed during anatexis of B-rich pelitic rocks under granulite facies conditions. Structurally related to mullite. |
| IMA Status: |
Approved IMA 2007 (Dana # Added) |
| Locality: |
Mount Stafford, Northern Territory, Australia Link to MinDat.org Location Data. |
| Name Origin: |
Named as the boron analog to mullite. |
| Synonym: |
IMA2007-021 |
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Boromullite Image |
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Images:
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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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Images:
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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 |
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Boromullite Crystallography
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| Axial Ratios: |
a:b:c =0.3805:1:0.5108 |
| Cell Dimensions: |
a = 5.7168, b = 15.023, c = 7.675, Z = 2; V = 659.16 Den(Calc)= 3.08 |
| Crystal System: |
Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: C mc21 |
| 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), |
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Physical Properties of Boromullite
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| Cleavage: |
None |
| Color: |
White. |
| Diaphaneity: |
Transparent |
| Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
| Luster: |
Vitreous (Glassy) |
| Streak: |
white |
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Optical Properties of Boromullite
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| Gladstone-Dale: |
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2067,KC= 0.2078
Ncalc = 1.64 |
| Optical Data: |
Biaxial (+), a=1.627, b=1.634, g=1.649, bire=0.0220 |
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Calculated Properties of Boromullite
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| Electron Density: |
Bulk Density (Electron Density)=3.03 gm/cc
note: Specific Gravity of Boromullite =3.08 gm/cc.
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| Fermion Index: |
Fermion Index = 0.008500053
Boson Index = 0.991499947 |
| Photoelectric: |
PEBoromullite = 1.59 barns/electron
U=PEBoromullite x rElectron Density= 4.82 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Boromullite is Not Radioactive |
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Boromullite Classification
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| Dana Class: |
52.02.02a.03 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.02)with cations in [4] and >[4] coordination |
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(52.02.02a)Al2SiO5 (Sillimanite subgroup) |
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52.02.02a.01 Sillimanite Al2SiO5=Al[6]Al[4]OSiO4 P nma 2/m 2/m 2/m |
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52.02.02a.02 Mullite Al(42x)Si(2-2x)O(10-x)wherex=0.17to0.59 Pbam 2/m 2/m 2/m |
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52.02.02a.03 Boromullite! Al4.5SiB0.5O9.5 C mc21 mm2 |
| Strunz Class: |
09.AF.23 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AF -Nesosilicates with additional anions; |
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09.AF.23 Boromullite! Al4.5SiB0.5O9.5 C mc21 mm2 |
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Other Boromullite Information
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| References: |
NAME( AmMin, v94:648) PHYS. PROP.(AmMin, v94:648) OPTIC PROP.(AmMin, v94:648) |
| 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 :
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Boromullite
Al4.5SiB0.5O9.5
Dana No: 52.02.02a.03 Strunz No: 09.AF.23
Locality:
Notes:
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