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
Castle Rock, Edgemont Township, Delaware County, Pennsylvania, USA


Locality type:Village
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 Castle Rock, Edgemont Township, Delaware County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360481
Long-form Identifier:1:3:360481:6
GUID (UUID V4):0
Nearest other occurrences of Serpentine Subgroup
3.4km (2.1 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
7.5km (4.7 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
8.8km (5.5 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
13.8km (8.6 miles) ⓘMarshall Quarry, West Goshen Township, Chester County, Pennsylvania, USA
14.6km (9.1 miles) ⓘBrinton's Quarry, Westtown Township, Chester County, Pennsylvania, USA
16.9km (10.5 miles) ⓘRose's Quarry, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
17.6km (10.9 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
21.2km (13.2 miles) ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
24.7km (15.3 miles) ⓘCorundum Hill, Newlin Township, Chester County, Pennsylvania, USA
25.3km (15.7 miles) ⓘMount Cuba serpentinite, New Castle County, Delaware, USA
References
Samuel S. Gordon, pg. 188
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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