Downeyite Mineral Data

Downeyite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[Newest Minerals] [Minerals for Sale] [Educational Articles] [About Us] [Image Gallery]
John Betts - Fine Minerals
Classic minerals, out-of-print books & magazines, plus informative articles for collectors


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
 

Search for Downeyite Images

Click Here To Search Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.
  

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:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


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 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: 04.04.03.01 (04)Simple Oxides
  (04.04)with a cation charge of 4+ (A++++ O2)
  (04.04.03)Dana Group
 
04.04.03.01 Downeyite SeO2 P 4/mbc 4/m 2/m 2/m
 
04.04.03.02 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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Downeyite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Downeyite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Downeyite Mineral Data :

Ask about Downeyite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Downeyite Specimen Label here :

Downeyite

SeO2
Dana No: 04.04.03.01 Strunz No: 04.DE.05
Locality:

 

Notes: