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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Ishikawaite from
Spinelli prospect (Spinelli quarry), Glastonbury, Hartford County, Connecticut, USA


Locality type:Prospect
Classification
Species:Ishikawaite
Formula:U4+Fe2+Nb2O8
Comments:Although ishikawaite has been found at some former samarskite-(Y) localities, all analyses of Spinelli Prospect specimens show they are consistent with samarskite-(Y).
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Ishikawaite data
Locality Data:Click here to view Spinelli prospect (Spinelli quarry), Glastonbury, Hartford County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:13562
Long-form Identifier:1:3:13562:5
GUID (UUID V4):0
Nearest other occurrences of Ishikawaite
9.8km (6.1 miles) ⓘPenfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, USA
References
Hanson, S. L., Jarnot, B. M., Falster, A. U., Simmons, W. B., Nizamoff, J. W.: (2003) "Nb-Ta-Ti Oxide Minerals from Two Pegmatites of the Middletown Area, Connecticut," abstract in "Contributed Papers in Specimen Mineralogy, Part 2, 30th Rochester Mineralogical Symposium", Rocks & Minerals, Vol. 79, No. 4, p. 255.
 
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