Downeyite Mineral Data

Downeyite Mineral Data +

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General Downeyite Information

Chemical Formula:

SeO2

Composition:

Molecular Weight = 110.96 gm

Selenium 71.16 % Se 100.00 % SeO₂

Oxygen 28.84 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SeO₂

IMA Status:

Approved IMA 1977

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 72366

PDF 22-1314

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Downeyite Crystallography

Axial Ratios:

a:c = 1:0.60645

Cell Dimensions:

a = 8.36, c = 5.07, Z = 8; V = 354.34 Den(Calc)= 4.16

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/I_o): 3.36(1), 4.64(0.85), 5.28(0.75),

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

Color:

Colorless.

Density:

4.146

Diaphaniety:

Transparent

Luster:

Adamantine

Streak:

white

Optical Properties of Downeyite

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

Electron Density:

r_electron=3.75 gm/cc
note: r_Downeyite=4.16 gm/cc.

Fermion Index

Fermion Index = 0.05422
Boson Index = 0.94578

Photoelectric:

PE_Downeyite= 55.58 barns/electron
U=PE_Downeyite x r_electron= 208.36 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Downeyite is Not Radioactive

Downeyite Classification

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

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

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

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

Downeyite

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

Notes: