Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Downeyite from
Forestville Coal Dump Fires, Schuylkill County, Pennsylvania, USA


Locality type:Coal Dump Fire
Classification
Species:Downeyite
Formula:SeO2
Confirmation
Validity:Valid - Type Locality
Data
Mineral Data:Click here to view Downeyite data
Locality Data:Click here to view Forestville Coal Dump Fires, Schuylkill County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:4670
Long-form Identifier:1:3:4670:1
GUID (UUID V4):0
Nearest other occurrences of Downeyite
23.3km (14.5 miles) ⓘBurnside, Northumberland County, Pennsylvania, USA
References
Finkelman, Robert B., Mrose, Mary E. (1977) Downeyite, the first verified natural occurrence of SeO2. American Mineralogist, 62 (3-4) 316-320
 
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