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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Stilbite Subgroup from
Falls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA


Locality type:Waterfall
Classification
Species:'Stilbite Subgroup' (not an IMA approved species)
Formula:M6-7[Al8-9Si27-28O72] · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Stilbite Subgroup data
Locality Data:Click here to view Falls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:502255
Long-form Identifier:1:3:502255:7
GUID (UUID V4):0
Nearest other occurrences of Stilbite Subgroup
2.3km (1.4 miles) ⓘMcKinney's Quarry, Rittenhouse Lane, Philadelphia, Philadelphia County, Pennsylvania, USA
4.3km (2.7 miles) ⓘRock Hill Road, Pencoyd (West Manayunk), Lower Merion Township, Montgomery County, Pennsylvania, USA
5.8km (3.6 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
7.9km (4.9 miles) ⓘHoffman's Quarry (Hoffmans Quarry), Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
8.5km (5.3 miles) ⓘClark's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
8.6km (5.4 miles) ⓘWilliam's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
8.8km (5.4 miles) ⓘBarber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
17.2km (10.7 miles) ⓘDeshong's Quarry, Leiperville, Ridley Township, Delaware County, Pennsylvania, USA
25.0km (15.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
30.7km (19.1 miles) ⓘInterstate 95 roadcut, New Castle County, Delaware, USA
References
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp. p.125
 
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