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Sellaite Mineral Data

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General Sellaite Information

Help on Chemical  Formula: Chemical Formula: MgF2
Help on Composition: Composition: Molecular Weight = 62.30 gm
   Magnesium  39.01 %  Mg   64.69 % MgO
   Fluorine   60.99 %  F    60.99 % F
                -   %   F   -25.68 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgF2
Help on Environment: Environment: Bituminous dolomite-anhydrite rock.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Gebroulaz glacier, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Quintino Sella (1827-1884), Italian mining engineer and mineralogist.
Help on Name Pronunciation: Name Pronunciation: Sellaite Say SELLAITE
Help on Synonym: Synonym: ICSD 8121
  PDF 41-1443

Sellaite Image

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Comments: Compact, white acicular sellaite crystals.
Location: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-W├╝rttemberg, Germany. Scale: 21x16x10 mm.
© John Betts - Fine Minerals

Sellaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.66051
Help on Cell Dimensions: Cell Dimensions: a = 4.66, c = 3.078, Z = 2; V = 66.84 Den(Calc)= 3.10
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 41/mnm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.27(1), 2.231(0.95), 1.711(0.75),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 2 2 1) ( 1 1 0) ( 0 1 0) ( 2 1 0) ( 0 1 1)

Warning: this java applet does not work in some browsers because of security restrictions.


Physical Properties of Sellaite

Help on Cleavage: Cleavage: {100} Distinct, {110} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.97 - 3.15, Average = 3.06
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Sellaite

Help on Optical Data: Optical Data: Uniaxial (+), w=1.378, e=1.39, bire=0.0120.

Calculated Properties of Sellaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Sellaite =3.10 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PESellaite = 1.18 barns/electron
U=PESellaite x rElectron Density= 3.51 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sellaite is Not Radioactive

Sellaite Classification

Help on  Dana Class: Dana Class: (09)Anhydrous and Hydrated Halides
  (09.02)where A (X)2
  (09.02.02)Dana Group Sellaite MgF2 P 41/mnm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 03.AB.15 03 - HALIDES
  03.A - Simple Halides, Without H2O
  03.AB -M:X = 1:2
03.AB.15 Sellaite MgF2 P 41/mnm 4/m 2/m 2/m

Other Sellaite Information

Help on References: References: NAME( AntBidBlaNic3) 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 Sellaite :
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: 03.AB.15





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