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
Dyer Quarry, Gibraltar, Birdsboro, Berks County, Pennsylvania, 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 Dyer Quarry, Gibraltar, Birdsboro, Berks County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:148259
Long-form Identifier:1:3:148259:1
GUID (UUID V4):0
Nearest other occurrences of Laumontite
4.1km (2.6 miles) ⓘH&K Birdsboro Materials Quarry (Dyer Trap Rock Quarry; Hay Creek Trap Rock Quarry), Hay Creek, Birdsboro, Berks County, Pennsylvania, USA
10.9km (6.8 miles) ⓘGrace Mine, Morgantown, Berks County, Pennsylvania, USA
13.6km (8.4 miles) ⓘSilver Hill Quarry, Bowmansville, Brecknock Township, Lancaster County, Pennsylvania, USA
15.3km (9.5 miles) ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
46.0km (28.6 miles) ⓘCornwall Mines (Cornwall Iron Mine), Cornwall Borough (Cornwall), Lebanon County, Pennsylvania, USA
54.3km (33.7 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
59.4km (36.9 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
61.6km (38.3 miles) ⓘBrandywine Quarry (Hubbard Quarry), Wilmington, New Castle County, Delaware, USA
63.4km (39.4 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
63.5km (39.5 miles) ⓘMcKinney's Quarry, Rittenhouse Lane, Philadelphia, Philadelphia County, Pennsylvania, USA
References
Rocks & Min.: 21:278
23:914-915.
Rocks & Min.: 21:142-143.
 
and/or  
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