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Downeyite

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Burnside, Northumberland Co., Pennsylvania, USA
© Ł Kruszewski 08

Formula:
SeO
 
2
System:TetragonalColour:Colourless (red - ...
Lustre:Adamantine
Name:For Wayne F. Downey, Jr., who discovered the mineral. He was a high school student at the time.
This page provides mineralogical data about Downeyite.

Classification of Downeyite

IMA status:Approved 1974
Strunz 8th edition ID:4/D.14-20
Nickel-Strunz 10th (pending) edition ID:4.DE.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
Dana 8th edition ID:4.4.3.1

4 : SIMPLE OXIDES
4 : AX2
Hey's CIM Ref.:7.17.1

7 : Oxides and Hydroxides
17 : Oxides of Se and Te
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Type Occurrence of Downeyite

Type Locality:Forestville, Schuylkill Co., Pennsylvania, USA
General Appearance of Type Material:Acicular to prismatic crystals
Place of Conservation of Type Material:Smithsonian
Year of Discovery:1971
Geological Setting of type material:Burning anthracite culm banks

Occurrences of Downeyite

Geological Setting:Burning coal banks.

Physical Properties of Downeyite

Lustre:Adamantine
Diaphaneity (Transparency):Transparent
Colour:Colourless (red - included selenium, yelllow - included sulfur)
Density (calculated):4.146 g/cm3

Crystallography of Downeyite

Crystal System:Tetragonal
Cell Parameters:a = 8.36Å, c = 5.06Å
Ratio:a:c = 1 : 0.605
Unit Cell Volume:V 353.64 ų (Calculated from Unit Cell)
Morphology:Acicular crystals to 2 cm.

Optical Data of Downeyite

Type:Uniaxial (+)
Comments:Extremely hydroscopic. In air will deliquesce in a few minutes and be absorbed into substrate or evaporate leaving colorless film.

Chemical Properties of Downeyite

Formula:
SeO
 
2
Essential elements:O, Se
All elements listed in formula:O, Se

Relationship of Downeyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DE.10Koragoite
(Mn
2+
 
,Fe
3+
 
)
 
3
(Nb,Ta,Ti)
 
2
(Nb,Mn)
 
2
(W,Ta)
 
2
O
 
20
4.DE.15Koechlinite
(BiO)
 
2
[MoO
 
4
]
4.DE.15Russellite
(BiO)
 
2
[WO
 
4
]
4.DE.15Tungstibite
Sb
 
2
WO
 
6
4.DE.20Tellurite
TeO
 
2
4.DE.25Paratellurite
TeO
 
2
4.DE.30Bismutotantalite
Bi(Ta,Nb)O
 
4
4.DE.30Bismutocolumbite
Bi(Nb,Ta)O
 
4
4.DE.30Cervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.30Stibiotantalite
Sb(Ta,Nb)O
 
4
4.DE.30Stibiocolumbite
Sb(Nb,Ta)O
 
4
4.DE.30Clinocervantite
Sb
3+
 
Sb
5+
 
O
 
4
4.DE.35Baddeleyite
ZrO
 
2
Related Minerals - Hey's Index Grouping:

- +
7.17.2Tellurite
TeO
 
2
7.17.3Paratellurite
TeO
 
2
7.17.4Chiluite
Bi
 
6
Mo
 
2
Te
 
2
O
 
21

Other Names for Downeyite

Synonyms:
IMA1974-063
Other Languages:
German:Downeyit
Russian:Доунейит
Spanish:Downeyita

Other Information

Fluorescence in UV light:None
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Downeyite

Reference List:Finkelman, R.B. & Mrose, M.E. (1977) American Mineralogist: 62,316-320.

Journal of the American Chemical Society: 59: 789-794.

Internet Links for Downeyite

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    Localities for Downeyite

    Hide Locality List
    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Pennsylvania
      • Northumberland Co.
    		 Mineralogy associated with burning Anthracite deposits of Eastern Pennsylvania, D. M. Lapham, J. H. Barns, W. Downey Jr. and R. B. Finkelman, Min. Rescs. Report #78, 1980
      • Schuylkill Co.
    		Finkelman, R.B. & Mrose, M.E. (1977) American Mineralogist: 62,316-320.
    Mineral and/or Locality
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