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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Serpentine Subgroup from
Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA


Locality type:Valley
Classification
Species:'Serpentine Subgroup' (not an IMA approved species)
Formula:D3[Si2O5](OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Serpentine Subgroup data
Locality Data:Click here to view Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:320604
Long-form Identifier:1:3:320604:1
GUID (UUID V4):0
Nearest other occurrences of Serpentine Subgroup
4.0km (2.5 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
4.6km (2.9 miles) ⓘRose's Quarry, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
20.5km (12.7 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
21.2km (13.2 miles) ⓘCastle Rock, Edgemont Township, Delaware County, Pennsylvania, USA
24.3km (15.1 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
26.8km (16.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
33.9km (21.1 miles) ⓘMarshall Quarry, West Goshen Township, Chester County, Pennsylvania, USA
35.8km (22.3 miles) ⓘBrinton's Quarry, Westtown Township, Chester County, Pennsylvania, USA
45.4km (28.2 miles) ⓘMount Cuba serpentinite, New Castle County, Delaware, USA
45.8km (28.4 miles) ⓘCorundum Hill, Newlin Township, Chester County, Pennsylvania, USA
References
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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