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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Glauconite from
Crawford County, Wisconsin, USA


Locality type:County
Classification
Species:'Glauconite' (not an IMA approved species)
Formula:K0.60-0.85(Fe3+,Mg,Al)2(Si,Al)4O10](OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Glauconite data
Locality Data:Click here to view Crawford County, Wisconsin, USA
Data Identifiers
Mindat Occurrence Record ID:859623
Long-form Identifier:1:3:859623:9
GUID (UUID V4):0
References
Herzog,L.F.,Pinson,W.H.Jr.,and Cormier,R.F.,(1958) Sediment age determination byRb/Sr analysis of glauconite:Bulletion of the American Association of Petroleum Geologists,v.42,p.717-733
 
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