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


Locality type:Quarry
Classification
Species:Laumontite
Formula:CaAl2Si4O12 · 4H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Laumontite data
Locality Data:Click here to view Brandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA
Data Identifiers
Mindat Occurrence Record ID:50042
Long-form Identifier:1:3:50042:1
GUID (UUID V4):0
Nearest other occurrences of Laumontite
17.1km (10.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
41.0km (25.5 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
43.2km (26.8 miles) ⓘMcKinney's Quarry, Rittenhouse Lane, Philadelphia, Philadelphia County, Pennsylvania, USA
43.5km (27.0 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
48.5km (30.1 miles) ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
51.8km (32.2 miles) ⓘHavre De Grace Quarry, Harford County, Maryland, USA
52.9km (32.9 miles) ⓘGrace Mine, Morgantown, Berks County, Pennsylvania, USA
58.1km (36.1 miles) ⓘH&K Birdsboro Materials Quarry (Dyer Trap Rock Quarry; Hay Creek Trap Rock Quarry), Hay Creek, Birdsboro, Berks County, Pennsylvania, USA
59.0km (36.7 miles) ⓘSilver Hill Quarry, Bowmansville, Brecknock Township, Lancaster County, Pennsylvania, USA
61.6km (38.3 miles) ⓘDyer Quarry, Gibraltar, Birdsboro, Berks County, Pennsylvania, USA
References
Rocks & Min.:11:216
21:280-281
AmMin:9(1924):1-5.
 
and/or  
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