Mineralogy Database

Sekaninaite Mineral Data

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General Sekaninaite Information

Help on Chemical  Formula: Chemical Formula: (Fe++,Mg)2Al4Si5O18
Help on Composition: Composition: Molecular Weight = 632.27 gm
   Magnesium   1.92 %  Mg    3.19 % MgO
   Aluminum   17.07 %  Al   32.25 % Al2O3
   Iron       13.25 %  Fe   17.04 % FeO
   Silicon    22.21 %  Si   47.52 % SiO2
   Oxygen     45.55 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+1.5Mg0.5Al4Si5O18
Help on Environment: Environment: Pegmatitic rocks.
Help on IMA Status: IMA Status: Approved IMA 1975
Help on Locality: Locality: Kolni Bory, Czechoslovakia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Czechoslovakian mineralogist, J. Sekanina (1901-1986).
Help on Name Pronunciation: Name Pronunciation: Sekaninaite + Pronunciation Say SEKANINAITE
Help on Synonym: Synonym: ICSD 100490
  PDF 31-616

Sekaninaite Image

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Comments: Black-green crystalline sekaninaite cleavage with dark purple colored fracture surface.
Location: Rozna, Moravia, Jihomoravsky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sekaninaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7488:1:0.9461
Help on Cell Dimensions: Cell Dimensions: a = 17.186, b = 9.827, c = 9.298, Z = 4; V = 1,570.31 Den(Calc)= 2.67
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C ccm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.376(1), 3.386(1), 8.583(1),

Physical Properties of Sekaninaite

Help on Cleavage: Cleavage: {100} Good
Help on Color: Color: Blue, Blue violet, Violet blue, Gray blue.
Help on Density: Density: 2.77
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Sekaninaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2134,KPDmeas= 0.2057,KC= 0.204
Ncalc = 1.54 - 1.57
Help on Optical Data: Optical Data: Biaxial (-), a=1.561, b=1.572, g=1.576, bire=0.0150, 2V(Calc)=60, 2V(Meas)=66.

Calculated Properties of Sekaninaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Sekaninaite =2.77 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESekaninaite = 5.32 barns/electron
U=PESekaninaite x rElectron Density= 14.48 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sekaninaite is Not Radioactive

Sekaninaite Classification

Help on  Dana Class: Dana Class: (61)Cyclosilicate Six-Membered Rings
  (61.02)with Al substituted rings
  (61.02.01)Cordierite group Cordierite Mg2Al4Si5O18 C ccm 2/m 2/m 2/m Sekaninaite (Fe,Mg)2Al4Si5O18 C ccm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.CJ.10 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.10 Cordierite Mg2Al4Si5O18 C ccm 2/m 2/m 2/m
09.CJ.10 Sekaninaite (Fe,Mg)2Al4Si5O18 C ccm 2/m 2/m 2/m

Other Sekaninaite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Sekaninaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.CJ.10





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