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
Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA


Locality type:Valley
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 Wissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:320601
Long-form Identifier:1:3:320601:0
GUID (UUID V4):0
Nearest other occurrences of Actinolite
4.0km (2.5 miles) ⓘPrince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA
4.2km (2.6 miles) ⓘGladwyne Quarries, Gladwyne, Lower Merion Township, Montgomery County, Pennsylvania, USA
5.8km (3.6 miles) ⓘFalls of Schuylkill, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA
20.5km (12.7 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
24.3km (15.1 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
26.8km (16.6 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
36.4km (22.6 miles) ⓘOsborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
36.7km (22.8 miles) ⓘKibblehouse Quarry, Perkiomenville, Marlborough Township, Montgomery County, Pennsylvania, USA
39.3km (24.4 miles) ⓘRock Hill Quarry, Rock Hill, East Rockhill Township, Bucks County, Pennsylvania, USA
43.3km (26.9 miles) ⓘLambertville Quarry (Trap Rock Industries Lambertville Quarry; Mt. Gilboa Quarry), Delaware Township, Hunterdon County, New Jersey, USA
References
Gordon, Samuel G. (1922) The Mineralogy of Pennsylvania. Special Publication 1. The Academy of Natural Sciences of Philadelphia 255pp.
 
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