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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Pyrolusite from
Osborne Hill, Birmingham Township, Chester County, Pennsylvania, USA


Locality type:Hill
Classification
Species:Pyrolusite
Formula:Mn4+O2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Pyrolusite data
Locality Data:Click here to view Osborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360243
Long-form Identifier:1:3:360243:0
GUID (UUID V4):0
Nearest other occurrences of Pyrolusite
32.6km (20.2 miles) ⓘSpring Mill Iron Ore pits, Whitemarsh Township, Montgomery County, Pennsylvania, USA
36.0km (22.4 miles) ⓘD.O. Hitner's Mine, Whitemarsh Township, Montgomery County, Pennsylvania, USA
40.0km (24.9 miles) ⓘOreland, Springfield Township, Montgomery County, Pennsylvania, USA
42.4km (26.3 miles) ⓘEdge Hill Iron Company Mine, Springfield Township, Montgomery County, Pennsylvania, USA
46.0km (28.6 miles) ⓘKibblehouse Quarry, Perkiomenville, Marlborough Township, Montgomery County, Pennsylvania, USA
50.3km (31.2 miles) ⓘCedar Hill Quarry (Stoltzfuss Quarry), Fulton Township, Lancaster County, Pennsylvania, USA
71.8km (44.6 miles) ⓘFriedensville Mine, Friedensville, Upper Saucon Township, Lehigh County, Pennsylvania, USA
73.5km (45.7 miles) ⓘMud Lake - Grubb Lake, West Hempfield Township, Lancaster County, Pennsylvania, USA
73.6km (45.7 miles) ⓘMountainville, Salisbury Township, Lehigh County, Pennsylvania, USA
94.5km (58.7 miles) ⓘSherrer Quarry, C.K. Williams Quarry complex, Chestnut Hill, Easton, Northampton County, Pennsylvania, USA
References
Samuel S. Gordon, pg. 167
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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