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Khmaralite Mineral Data
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General Khmaralite Information
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 Chemical Formula: |
(Mg,Al,Fe)16(Al,Si,Be)12O40 |
| Composition: |
Molecular Weight = 1,401.96 gm |
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Magnesium 16.64 % Mg 27.60 % MgO |
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Beryllium 1.03 % Be 2.85 % BeO |
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Aluminum 23.09 % Al 43.64 % Al2O3 |
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Iron 6.37 % Fe 8.20 % FeO |
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Silicon 7.21 % Si 15.43 % SiO2 |
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Oxygen 45.65 % O |
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______ ______ |
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100.00 % 97.72 % = TOTAL OXIDE |
| Empirical Formula: |
Mg9.6Al4.8Fe2+1.6Al7.2Si3.6Be1.6O40 |
| Environment: |
In a single specimen of a pegmatite. A member of the sapphirine group |
| IMA Status: |
Approved IMA 1998 (Dana # Added) |
| Locality: |
From "Zircon Point,", Khmara Bay, Enderby Land, Antarctica. Link to MinDat.org Location Data. |
| Name Origin: |
For the locality, which was named in honor of Ivan Fedorovich Khmara (1936-1956), a tractor driver who perished in Antarctica. |
| Synonym: |
ICSD 87692 |
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IMA1998-027 |
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Khmaralite Crystallography
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| Axial Ratios: |
a:b:c =1.3081:1:0.7831 |
| Cell Dimensions: |
a = 18.8, b = 14.371, c = 11.254, Z = 4; beta = 125.53° V = 2,474.43 Den(Calc)= 3.76 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c |
| 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), |
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Physical Properties of Khmaralite
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| Cleavage: |
None |
| Color: |
Very dark green. |
| Diaphaneity: |
Transparent |
| Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Habit: |
Foliated - Two dimensional platy forms. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Hardness: |
7 - Quartz |
| Luster: |
Vitreous (Glassy) |
| Streak: |
grayish green |
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Optical Properties of Khmaralite
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| Gladstone-Dale: |
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KC= 0.1999
Ncalc = 1.75 |
| 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. |
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Calculated Properties of Khmaralite
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| Electron Density: |
Bulk Density (Electron Density)=3.70 gm/cc
note: Specific Gravity of Khmaralite =3.76 gm/cc.
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| Fermion Index: |
Fermion Index = 0.03
Boson Index = 0.97 |
| Photoelectric: |
PEKhmaralite = 3.22 barns/electron
U=PEKhmaralite x rElectron Density= 11.92 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Khmaralite is Not Radioactive |
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Khmaralite Classification
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| Dana Class: |
69.02.01b.03 (69)Inosilicate Chains with Side Branches or Loops |
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(69.02)with P>2 |
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(69.02.01b)Aenigmatite and related species (Sapphirine subgroup) |
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69.02.01b.01 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1 |
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69.02.01b.02 Surinamite (Mg,Fe)3Al4BeSi3O16 P 21/n 2/m |
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69.02.01b.03 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m |
| Strunz Class: |
09.DH.45 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DH -Inosilicates with 4-periodic single chains, Si4O12 |
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09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1 |
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09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri |
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09.DH.45 Krinovite NaMg2CrSi3O10 P1 1 |
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09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1 |
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09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1 |
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09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1 |
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09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m |
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09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1 |
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09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1 |
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09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1 |
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Other Khmaralite Information
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| References: |
NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4) |
| 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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Print or Cut-and-Paste your Khmaralite Specimen Label here :
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Khmaralite
(Mg,Al,Fe)16(Al,Si,Be)12O40
Dana No: 69.02.01b.03 Strunz No: 09.DH.45
Locality:
Notes:
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