Mullite Mineral Data + Say MULLITE

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General Mullite Information

Help on Chemical  Formula: Chemical Formula: Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59
Help on Composition: Composition: Molecular Weight = 319.54 gm
   Aluminum  38.00 %  Al   71.79 % Al2O3
   Silicon   13.18 %  Si   28.21 % SiO2
   Oxygen    48.82 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al4.5Si1.5O9.75
Help on Environment: Environment: Remelted Tertiary-aged clays.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1924
Help on Locality: Locality: Isle of Mull, Scotland, England. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
 

Mullite Image

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Mullite

Comments: Opaque white mullite masses with mica.
Location: Nijar, Almeria, Andalucia, Spain. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Mullite

Comments: Surface of a kaolinite stratum altered to white mullite by a prehistoric coal-seam-fire..
Location: Mt. Wingen (Burning Mountain), NSW, Australia. Scale: Picture size 6x4 cm.
© Dave Barthelmy

Mullite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9865:1:0.3757
Help on Cell Dimensions: Cell Dimensions: a = 7.5785, b = 7.6817, c = 2.8864, Z = 1; V = 168.03 Den(Calc)= 3.16
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbam
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.39(1), 3.428(0.95), 2.206(0.6),
Click Here for Large Mullite Structure Window Crystal Structure:

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Angel R J , Prewitt C T , American Mineralogist , 71 (1986) p.1476-1482, Crystal structure of mullite: A re-examination of the average structure

View Additional jPOWD Structure files for Mullite
[1] [10] [11] [2] [3] [4] [5] [6] [7] [8] [9]
 

Physical Properties of Mullite

Help on Cleavage: Cleavage: [010] Good
Help on Color: Color: Colorless, Violet, Yellow, White, Light pink.
Help on Density: Density: 3 - 3.1, Average = 3.05
Help on Diaphaniety: Diaphaniety: Transparent to translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6-7 - Orthoclase-Quartz
Help on Luminescence: Luminescence: None.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Mullite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2146,KC= 0.2073
Help on Optical Data: Optical Data: Biaxial (+), a=1.642-1.653, b=1.644-1.655, g=1.654-1.679, bire=0.0120-0.0260, 2V(Calc)=34-50, 2V(Meas)=20-50. Dispersion r > v.
Help on Pleochroism (x): Pleochroism (x): colorless or colorless.
Help on Pleochroism (y): Pleochroism (y): colorless or colorless.
Help on Pleochroism (z): Pleochroism (z): colorless or rose.
 

Calculated Properties of Mullite

Help on Electron Density: Electron Density:

relectron=3.12 gm/cc
note: rMullite =3.16 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00639
Boson Index = 0.99361
Help on Photoelectric: Photoelectric:

PEMullite = 1.62 barns/electron
U=PEMullite x relectron= 5.04 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mullite is Not Radioactive

 

Mullite Classification

Help on  Dana Class: Dana Class: 52.2.2a.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.2)with cations in [4] and >[4] coordination
  (52.2.2a)Al2SiO5 (Sillimanite subgroup)
 
52.2.2a.1 Sillimanite Al2SiO5=Al[6]Al[4]OSiO4 P nma 2/m 2/m 2/m
 
52.2.2a.2 Mullite Al(42x)Si(2-2x)O(10-x)wherex=0.17to0.59 Pbam 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VIII/B.02-50 VIII - Silicates
  VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cations of octahedral and tetrahedral orientation [4/6]
  VIII/B.02 - Disthene series
 
VIII/B.02-10 Sillimanite Al2SiO5=Al[6]Al[4]OSiO4 P nma 2/m 2/m 2/m
 
VIII/B.02-20 Andalusite Al2SiO5=Al[6]Al[5]OSiO4 Pnnm 2/m 2/m 2/m
 
VIII/B.02-30 Kanonaite (Mn,Al)AlSiO5 Pnnm 2/m 2/m 2/m
 
VIII/B.02-40 Kyanite Al2SiO5=Al[6]Al[6]OSiO4 P1 1
 
VIII/B.02-50 Mullite Al(42x)Si(2-2x)O(10-x)wherex=0.17to0.59 Pbam 2/m 2/m 2/m
 
VIII/B.02-60 Yoderite Mg2(Al,Fe)6Si4O18(OH)2 P 21 2
 
VIII/B.02-70 Topaz Al2SiO4(F,OH)2 Pbnm 2/m 2/m 2/m
 

Other Mullite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Mullite :
1 -Am. Min. Crystal Structure Database 2 - Applied Mineralogy 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris

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

Mullite

Al(4+2x)Si(2-2x)O(10-x) where x =0.17 to 0.59
Dana No: 52.2.2a.2 Strunz No: VIII/B.02-50
Locality:

 

Notes:

 

 
   
 
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