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
Brinton's Quarry, Westtown Township, Chester County, Pennsylvania, USA


Locality type:Quarry
Classification
Species:'Serpentine Subgroup' (not an IMA approved species)
Formula:D3[Si2O5](OH)4
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Hydromagnesite1
Data
Mineral Data:Click here to view Serpentine Subgroup data
Locality Data:Click here to view Brinton's Quarry, Westtown Township, Chester County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:149407
Long-form Identifier:1:3:149407:5
GUID (UUID V4):0
Nearest other occurrences of Serpentine Subgroup
7.3km (4.5 miles) ⓘMarshall Quarry, West Goshen Township, Chester County, Pennsylvania, USA
10.6km (6.6 miles) ⓘCorundum Hill, Newlin Township, Chester County, Pennsylvania, USA
12.7km (7.9 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
13.6km (8.4 miles) ⓘMount Cuba serpentinite, New Castle County, Delaware, USA
14.5km (9.0 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
14.6km (9.1 miles) ⓘCastle Rock, Edgemont Township, Delaware County, Pennsylvania, USA
15.9km (9.9 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
31.4km (19.5 miles) ⓘRose's Quarry, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
31.5km (19.6 miles) ⓘWarwick Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA
32.2km (20.0 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
References
Dana 6: 1068.
 
and/or  
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