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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Chalcedony from
Ecton Mine, Perkiomen Mines, Audubon, Lower Providence Township, Montgomery County, Pennsylvania, USA


Locality type:Mine
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Ecton Mine, Perkiomen Mines, Audubon, Lower Providence Township, Montgomery County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:148100
Long-form Identifier:1:3:148100:6
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
17.0km (10.6 miles) ⓘCastle Rock, Edgemont Township, Delaware County, Pennsylvania, USA
19.1km (11.9 miles) ⓘBroomall, Township of Marple, Delaware County, Pennsylvania, USA
33.6km (20.9 miles) ⓘCorundum Hill, Newlin Township, Chester County, Pennsylvania, USA
45.5km (28.2 miles) ⓘFritz Island Mines, Cumru Township, Berks County, Pennsylvania, USA
47.0km (29.2 miles) ⓘHenry Erwin & Sons Mine, Topton, Berks County, Pennsylvania, USA
62.4km (38.8 miles) ⓘWhite Barrens, Elk Township, Chester County, Pennsylvania, USA
71.6km (44.5 miles) ⓘWood's Chrome Mine, Texas, Little Britain Township, Lancaster County, Pennsylvania, USA
74.0km (46.0 miles) ⓘCedar Hill Quarry (Stoltzfuss Quarry), Fulton Township, Lancaster County, Pennsylvania, USA
75.1km (46.7 miles) ⓘJenkins Mine (Jenkins Corner; North Rock Springs), Fulton Township, Lancaster County, Pennsylvania, USA
75.3km (46.8 miles) ⓘRock Springs Run, Fulton Township, Lancaster County, Pennsylvania, USA
References
Boucot, Arthur James (1949) Notes on the Ecton Mine, Montgomery County, Pennsylvania. Rocks & Minerals, 24(9-10), 492-495.
 
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