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Khmaralite Mineral Data |
General Khmaralite Information |
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(Mg,Al,Fe)16(Al,Si,Be)12O40 | |
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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 | ||
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Mg9.6Al4.8Fe2+1.6Al7.2Si3.6Be1.6O40 | |
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In a single specimen of a pegmatite. A member of the sapphirine group | |
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Approved IMA 1998 (Dana # Added) | |
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From "Zircon Point,", Khmara Bay, Enderby Land, Antarctica. Link to MinDat.org Location Data. | |
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For the locality, which was named in honor of Ivan Fedorovich Khmara (1936-1956), a tractor driver who perished in Antarctica. | |
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ICSD 87692 | |
IMA1998-027 | ||
Khmaralite Crystallography |
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a:b:c =1.3081:1:0.7831 | |
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a = 18.8, b = 14.371, c = 11.254, Z = 4; beta = 125.53° V = 2,474.43 Den(Calc)= 3.76 | |
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c | |
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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 |
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None | |
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Very dark green. | |
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Transparent | |
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Brittle - Uneven - Very brittle fracture producing uneven fragments. | |
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Aggregates - Made of numerous individual crystals or clusters. | |
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Foliated - Two dimensional platy forms. | |
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Tabular - Form dimensions are thin in one direction. | |
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7 - Quartz | |
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Vitreous (Glassy) | |
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grayish green | |
Optical Properties of Khmaralite |
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CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1956,KC= 0.1999 Ncalc = 1.75 |
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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 |
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Bulk Density (Electron Density)=3.70 gm/cc note: Specific Gravity of Khmaralite =3.76 gm/cc. |
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Fermion Index = 0.03 Boson Index = 0.97 |
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PEKhmaralite = 3.22 barns/electron U=PEKhmaralite x rElectron Density= 11.92 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Khmaralite is Not Radioactive |
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Khmaralite Classification |
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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) | ||
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09.DH.45 09 - SILICATES (Germanates) | |
09.D - Inosilicates* Structural terminology according to Liebau (1985) | ||
09.DH -Inosilicates with 4-periodic single chains, Si4O12 | ||
Other Khmaralite Information |
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NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4) | |
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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 Search for Khmaralite using: Visit our Advertisers for Khmaralite : Ask about Khmaralite here : Print or Cut-and-Paste your Khmaralite Specimen Label here :
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