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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Quartz from
Brandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA


Locality type:Quarry
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Brandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA
Data Identifiers
Mindat Occurrence Record ID:50047
Long-form Identifier:1:3:50047:6
GUID (UUID V4):0
Nearest other occurrences of Quartz
2.1km (1.3 miles) ⓘRoute Interstate 95 at 7th Street, Wilmington, New Castle County, Delaware, USA
3.6km (2.2 miles) ⓘPetrillo Quarry (Shellpot Quarry), Wilmington, New Castle County, Delaware, USA
7.3km (4.6 miles) ⓘWoodlawn Quarry, Wilmington, New Castle County, Delaware, USA
10.1km (6.3 miles) ⓘSwain's Quarry, Pennsbury Township, Chester County, Pennsylvania, USA
10.8km (6.7 miles) ⓘBullock's Quarry, Brandywine Summit, Chadds Ford Township, Delaware County, Pennsylvania, USA
11.8km (7.3 miles) ⓘBoothwyn, Upper Chichester Township, Delaware County, Pennsylvania, USA
16.2km (10.1 miles) ⓘPocopson, Pocopson Township, Chester County, Pennsylvania, USA
16.3km (10.1 miles) ⓘMinshall Painter's house, near Pocopson, Birmingham Township, Chester County, Pennsylvania, USA
17.1km (10.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
17.9km (11.2 miles) ⓘUpland Quarry, Chester Township, Delaware County, Pennsylvania, USA
References
Rocks & Min.:11:216
21:280-281
AmMin:9(1924):1-5.
 
and/or  
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