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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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Schorl from
Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA


07125540017374840483483.jpg
Schorl, etc.

Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA
07125540017374840483483.jpg
Schorl, etc.

Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA
03363730017374840493369.jpg
Schorl, etc.

Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA
Classification
Species:Schorl
Formula:NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Muscovite1
Data
Mineral Data:Click here to view Schorl data
Locality Data:Click here to view Smedley Park beryl locality, Springfield Township, Delaware County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:150606
Long-form Identifier:1:3:150606:8
GUID (UUID V4):0
Nearest other occurrences of Schorl
1.4km (0.9 miles) ⓘDeshong's Quarry, Leiperville, Ridley Township, Delaware County, Pennsylvania, USA
12.0km (7.5 miles) ⓘHaddington section, Philadelphia, Philadelphia County, Pennsylvania, USA
12.1km (7.5 miles) ⓘBoothwyn, Upper Chichester Township, Delaware County, Pennsylvania, USA
13.2km (8.2 miles) ⓘHestonville, Philadelphia County, Pennsylvania, USA
15.9km (9.9 miles) ⓘRock Hill Road, Pencoyd (West Manayunk), Lower Merion Township, Montgomery County, Pennsylvania, USA
19.8km (12.3 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
20.0km (12.5 miles) ⓘBrinton's Quarry, Westtown Township, Chester County, Pennsylvania, USA
21.2km (13.1 miles) ⓘOsborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
25.2km (15.7 miles) ⓘBarber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA
27.2km (16.9 miles) ⓘDickson's Quarry (Dixon's Quarry), Wilmington, New Castle County, Delaware, USA
References
Lapham, Davis M., Geyer, Alan R. (1965) Mineral Collecting in Pennsylvania. Bulletin G33 (2nd ed.). Pennsylvania Geological Survey
Reed, Juliet C., Annotated Bibliography of Minerals New to the Pennsylvania List - 1965-1974, Min. Soc. of PA, Inc. (1976): 70-71
 
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