Mineralogy Database

Downeyite Mineral Data

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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 Environment: Environment: Sublimation product of gases escaping through vents in actively burning culm banks in anthracite coal deposits; forms at about 200 deg C near the vents.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Glen Lyon, Luzerne Co.,Pennsylvania, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Wayne F. Downey, Jr., of Harrisburg, Pennsylvania, USA, who first collected the mineral.
Help on Name Pronunciation: Name Pronunciation: Downeyite + Pronunciation Say DOWNEYITE
Help on Synonym: Synonym: ICSD 72366
  PDF 22-1314

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 Dipyramidal H-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),

Physical Properties of Downeyite

Help on Color: Color: Colorless.
Help on Density: Density: 4.146
Help on Diaphaneity: Diaphaneity: 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: Bulk Density (Electron Density)=3.75 gm/cc
note: Specific Gravity of Downeyite =4.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEDowneyite = 55.58 barns/electron
U=PEDowneyite x rElectron Density= 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: (04)Simple Oxides
  (04.04)with a cation charge of 4+ (A++++ O2)
  (04.04.03)Dana Group Downeyite SeO2 P 4/mbc 4/m 2/m 2/m Paratellurite TeO2 P 41212,P 43212 4 2 2
Help on  Strunz Class: Strunz Class: 04.DE.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DE -With medium-sized cations; with various polyhedra
04.DE.05 Downeyite SeO2 P 4/mbc 4/m 2/m 2/m

Other Downeyite Information

Help on References: References: NAME( AntBidBlaNic3) 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 - 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: 04.DE.05





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