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


Locality type:Hill
Classification
Species:Actinolite
Formula:◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Actinolite data
Locality Data:Click here to view Osborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:360238
Long-form Identifier:1:3:360238:6
GUID (UUID V4):0
Nearest other occurrences of Actinolite
14.0km (8.7 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
15.7km (9.8 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
16.8km (10.4 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
20.9km (13.0 miles) ⓘKeystone Trap Rock Quarry, Cornog, Wallace Township, Chester County, Pennsylvania, USA
30.4km (18.9 miles) ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
32.0km (19.9 miles) ⓘHopewell mine, Hopewell Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA
32.4km (20.1 miles) ⓘGladwyne Quarries, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
32.7km (20.3 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
34.3km (21.3 miles) ⓘIron Hill Mine (Chestnut Hill Mine), Newark, New Castle County, Delaware, USA
34.4km (21.4 miles) ⓘJones mine, Caernarvon Township, Berks 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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