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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
Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA


08494950017272090522720.jpg
Stilbite Subgroup

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
05158510017272090525530.jpg
Stilbite-Ca

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
08494950017272090522720.jpg
Stilbite Subgroup

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
05158510017272090525530.jpg
Stilbite-Ca

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
08494950017272090522720.jpg
Stilbite Subgroup

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
05158510017272090525530.jpg
Stilbite-Ca

Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
Locality type:Quarry
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 Barber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360635
Long-form Identifier:1:3:360635:3
GUID (UUID V4):0
Nearest other occurrences of Stilbite Subgroup
0.3km (0.2 miles) ⓘWilliam's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
0.4km (0.2 miles) ⓘClark's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
1.4km (0.9 miles) ⓘHoffman's Quarry (Hoffmans Quarry), Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
7.8km (4.9 miles) ⓘMcKinney's Quarry, Rittenhouse Lane, Philadelphia, Philadelphia County, Pennsylvania, USA
8.8km (5.4 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
11.7km (7.3 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
12.6km (7.9 miles) ⓘRock Hill Road, Pencoyd (West Manayunk), Lower Merion Township, Montgomery County, Pennsylvania, USA
25.3km (15.7 miles) ⓘDeshong's Quarry, Leiperville, Ridley Township, Delaware County, Pennsylvania, USA
33.1km (20.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
37.8km (23.5 miles) ⓘMoore, Hopewell Township, Mercer County, New Jersey, USA
References
Samuel S. Gordon, pg. 229
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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