Mineralogy Database

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

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 - Prismatic H-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),

Physical Properties of Khmaralite

Help on Cleavage: Cleavage: None
Help on Color: Color: Very dark green.
Help on Diaphaneity: Diaphaneity: 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
Ncalc = 1.75
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: Bulk Density (Electron Density)=3.70 gm/cc
note: Specific Gravity of Khmaralite =3.76 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEKhmaralite = 3.22 barns/electron
U=PEKhmaralite x rElectron Density= 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: 69.02.01b.03 (69)Inosilicate Chains with Side Branches or Loops
  (69.02)with P>2
  (69.02.01b)Aenigmatite and related species (Sapphirine subgroup)
69.02.01b.01 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
69.02.01b.02 Surinamite (Mg,Fe)3Al4BeSi3O16 P 21/n 2/m
69.02.01b.03 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.DH.45 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
09.DH.45 Krinovite NaMg2CrSi3O10 P1 1
09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1

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 - 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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Dana No: 69.02.01b.03 Strunz No: 09.DH.45





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