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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Columbite-(Fe) from
Riverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA


Locality type:Quarry
Classification
Species:Columbite-(Fe)
Formula:Fe2+Nb2O6
Habit:blocky to prismatic
Colour:black with iridescence
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Columbite-(Fe) data
Locality Data:Click here to view Riverside Quarry (Western Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:670280
Long-form Identifier:1:3:670280:9
GUID (UUID V4):0
Nearest other occurrences of Columbite-(Fe)
0.5km (0.3 miles) ⓘWhite Rocks Quarry (Consolidated Quarry), White Rock Mining District, Middletown, Middlesex County, Connecticut, USA
2.8km (1.8 miles) ⓘTollgate Quarry (Tollgate Mine; Bidwell Quarry; China-stone Quarry), Middletown, Middlesex County, Connecticut, USA
4.0km (2.5 miles) ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA
4.7km (2.9 miles) ⓘState Forest Quarry No. 2, Cobalt, East Hampton, Middlesex County, Connecticut, USA
4.9km (3.0 miles) ⓘPenfield Quarry (Oak Leaf Quarry), Portland, Middlesex County, Connecticut, USA
6.6km (4.1 miles) ⓘNathan Hall Quarry, East Hampton, Middlesex County, Connecticut, USA
6.7km (4.2 miles) ⓘState Forest Quarry No. 1, East Hampton, Middlesex County, Connecticut, USA
6.8km (4.2 miles) ⓘWalden Gem Quarry, Portland, Middlesex County, Connecticut, USA
7.2km (4.5 miles) ⓘBordonaro Quarry, Portland, Middlesex County, Connecticut, USA
7.7km (4.8 miles) ⓘJohn Salak Quarry, Haddam, Middlesex County, Connecticut, USA
References
Moritz, Harold (n.d.) Personal Communication.
 
and/or  
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