Downeyite Mineral Data + Say DOWNEYITE

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General Downeyite Information

Help on Chemical  Formula: Chemical Formula: SeO2
Help on Composition: Composition: Molecular Weight = 110.96 gm
   Selenium  71.16 %  Se  100.00 % SeO2
   Oxygen    28.84 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SeO2
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Synonym: Synonym: ICSD 72366
  PDF 22-1314
 

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Downeyite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.60645
Help on Cell Dimensions: Cell Dimensions: a = 8.36, c = 5.07, Z = 8; V = 354.34 Den(Calc)= 4.16
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mbc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.36(1), 4.64(0.85), 5.28(0.75),
Click Here for Large Downeyite Structure Window Crystal Structure:

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Stahl K , Legros J P , Galy J , Zeitschrift fur Kristallographie , 202 (1992) p.99-107, The crystal structure of SeO2 at 139 and 286 K, Note: T = 139 K, Locality: synthetic

View Additional jPOWD Structure files for Downeyite
[1]
 

Physical Properties of Downeyite

Help on Color: Color: Colorless.
Help on Density: Density: 4.146
Help on Diaphaniety: Diaphaniety: Transparent
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white
 

Optical Properties of Downeyite

Help on Optical Data: Optical Data: NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.195) where Ncalc=Dcalc*KC+1
NCalc= 1.81 - from Gladstone-Dale relationship (KC = 0.195) where Ncalc=Dmeas*KC+1
 

Calculated Properties of Downeyite

Help on Electron Density: Electron Density:

relectron=3.75 gm/cc
note: rDowneyite =4.16 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.05422
Boson Index = 0.94578
Help on Photoelectric: Photoelectric:

PEDowneyite = 55.58 barns/electron
U=PEDowneyite x relectron= 208.36 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Downeyite is Not Radioactive

 

Downeyite Classification

Help on  Dana Class: Dana Class: 4.4.3.1 (4)Simple Oxides
  (4.4)with a cation charge of 4+ (A++++ O2)
  (4.4.3)Dana Group
 
4.4.3.1 Downeyite SeO2 P 4/mbc 4/m 2/m 2/m
 
4.4.3.2 Paratellurite TeO2 P 41212,P 43212 4 2 2
Help on  Strunz Class: Strunz Class: IV/D.14-20 IV - Oxides
  IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)
  IV/D.14 - Anatase - Downeyite series
 
IV/D.14-10 Anatase TiO2 I 41/amd 4/m 2/m 2/m
 
IV/D.14-20 Downeyite SeO2 P 4/mbc 4/m 2/m 2/m
 

Other Downeyite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Downeyite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Downeyite

SeO2
Dana No: 4.4.3.1 Strunz No: IV/D.14-20
Locality:

 

Notes:

 

 
   
 
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