Khmaralite Mineral Data


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General Khmaralite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Al,Fe)16(Al,Si,Be)12O40
Help on Composition: Composition: Molecular Weight = 1,401.96 gm
   Magnesium  16.64 %  Mg   27.60 % MgO
   Beryllium   1.03 %  Be    2.85 % BeO
   Aluminum   23.09 %  Al   43.64 % Al2O3
   Iron        6.37 %  Fe    8.20 % FeO
   Silicon     7.21 %  Si   15.43 % SiO2
   Oxygen     45.65 %  O
             ______        ______ 
             100.00 %       97.72 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg9.6Al4.8Fe2+1.6Al7.2Si3.6Be1.6O40
Help on Environment: Environment: In a single specimen of a pegmatite. A member of the sapphirine group
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: From "Zircon Point,", Khmara Bay, Enderby Land, Antarctica. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the locality, which was named in honor of Ivan Fedorovich Khmara (1936-1956), a tractor driver who perished in Antarctica.
Help on Synonym: Synonym: ICSD 87692
  IMA1998-027
 

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Khmaralite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.3081:1:0.7831
Help on Cell Dimensions: Cell Dimensions: a = 18.8, b = 14.371, c = 11.254, Z = 4; beta = 125.53° V = 2,474.43 Den(Calc)= 3.76
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.4446(1), 2.0106(0.85), 2.01(0.61),2.826(0.45), 2.4385(0.44), 2.3405(0.43),
Click Here for Large Khmaralite Structure Window Crystal Structure:

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Help on Above


Barbier J , Grew E S , Moore P B , Su S-C , American Mineralogist , 84 (1999) p.1650-1660, Khmaralite, a new beryllium-bearing mineral related to sapphirine:, A superstructure resulting from partial ordering of Be, Al and Si on, tetrahedral sites

 

Physical Properties of Khmaralite

Help on Cleavage: Cleavage: None
Help on Color: Color: Very dark green.
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Foliated - Two dimensional platy forms.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: grayish green
 

Optical Properties of Khmaralite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KC= 0.1999
Help on Optical Data: Optical Data: Biaxial (-), a=1.725, b=1.74, g=1.741, bire=0.0160, 2V(Calc)=28, 2V(Meas)=34. Dispersion r > v strong.
 

Calculated Properties of Khmaralite

Help on Electron Density: Electron Density:

relectron=3.70 gm/cc
note: rKhmaralite =3.76 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.03186
Boson Index = 0.96814
Help on Photoelectric: Photoelectric:

PEKhmaralite = 3.22 barns/electron
U=PEKhmaralite x relectron= 11.92 barns/cc.

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

Khmaralite is Not Radioactive

 

Khmaralite Classification

Help on  Dana Class: Dana Class: 69.2.1b.3 (69)Inosilicate Chains with Side Branches or Loops
  (69.2)with P>2
  (69.2.1b)Aenigmatite and related species (Sapphirine subgroup)
 
69.2.1b.1 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
 
69.2.1b.2 Surinamite (Mg,Fe)3Al4BeSi3O16 P 21/n 2/m
 
69.2.1b.3 Khmaralite ! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
Help on  Strunz Class: Strunz Class: VIII/F.15-15 VIII - Silicates
  VIII/F - Inosilicates (chain and band) modified double chains
  VIII/F.15 - Sapphirine - Surinamite series
 
VIII/F.15-10 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
 
VIII/F.15-15 Khmaralite (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
 
VIII/F.15-20 Surinamite (Mg,Fe)3Al4BeSi3O16 P 21/n 2/m
 

Other Khmaralite Information

Help on References: References: NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)
Help on See Also: See Also: Links to other databases for Khmaralite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Khmaralite

(Mg,Al,Fe)16(Al,Si,Be)12O40
Dana No: 69.2.1b.3 Strunz No: VIII/F.15-15
Locality:

 

Notes:

 

 
   
 
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