Sekaninaite Mineral Data (original) (raw)

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

Click Here for Larger Sekaninaite Image in a New Browser Window Images:

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 - DipyramidalH-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),

Click Here for Large Sekaninaite Structure Window Crystal Structure:

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| | Hochella M F , Brown G E , Ross F K , Gibbs G V , American Mineralogist , 64 (1979) p.337-351, High-temperature crystal chemistry of hydrous Mg- and Fe-cordierite, Dolni Bory, T = 24 C View Additional jPOWD Structure files for Sekaninaite [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:

61.02.01.02 (61)Cyclosilicate Six-Membered Rings

(61.02)with Al substituted rings

(61.02.01)Cordierite group

61.02.01.01 Cordierite Mg2Al4Si5O18 C ccm 2/m 2/m 2/m

61.02.01.02 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
15 - WWW-MINCRYST

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Ask about Sekaninaite here :
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Print or Cut-and-Paste your Sekaninaite Specimen Label here :

Sekaninaite

(Fe++,Mg)2Al4Si5O18
Dana No: 61.02.01.02 Strunz No: 09.CJ.10
Locality:

Notes: