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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
French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA


06563290017272033714238.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
06277120017272015338913.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
01595360017272015357752.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
01218540017272015371311.jpg
Actinolite, etc.

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
07657150017363797241525.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
06277120017272015338913.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
07859980017364547942256.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
03198090017366542622703.jpg
Actinolite, etc.

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
06563290017272033714238.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
06277120017272015338913.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
01595360017272015357752.jpg
Actinolite

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
01218540017272015371311.jpg
Actinolite, etc.

French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
Locality type:Mine
Classification
Species:Actinolite
Formula:◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Pyrite16
Calcite12
Magnetite12
Chalcopyrite10
Malachite1
Erythrite1
Amphibole Supergroup1
- var Byssolite1
Bornite1
Data
Mineral Data:Click here to view Actinolite data
Locality Data:Click here to view French Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
Photo GalleryView Gallery (10 photos)
Data Identifiers
Mindat Occurrence Record ID:95
Long-form Identifier:1:3:95:6
GUID (UUID V4):0
Nearest other occurrences of Actinolite
7.2km (4.5 miles) ⓘHopewell mine, Hopewell Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA
11.3km (7.0 miles) ⓘJones mine, Caernarvon Township, Berks County, Pennsylvania, USA
12.2km (7.6 miles) ⓘKeystone Trap Rock Quarry, Cornog, Wallace Township, Chester County, Pennsylvania, USA
13.9km (8.7 miles) ⓘGrace Mine, Morgantown, Berks County, Pennsylvania, USA
22.1km (13.8 miles) ⓘSilver Hill Quarry, Bowmansville, Brecknock Township, Lancaster County, Pennsylvania, USA
26.1km (16.2 miles) ⓘKibblehouse Quarry, Perkiomenville, Marlborough Township, Montgomery County, Pennsylvania, USA
30.4km (18.9 miles) ⓘOsborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
36.5km (22.7 miles) ⓘBlue Hill, Media, Upper Providence Township, Delaware County, Pennsylvania, USA
39.5km (24.5 miles) ⓘLenni, Middletown Township, Delaware County, Pennsylvania, USA
39.6km (24.6 miles) ⓘWilliamson Trade School, Middletown Township, Delaware County, Pennsylvania, USA
References
Rocks & Min.:64:7.
Sloto, Ronald A., Dickinson, Lana L. (1994) Famous Mineral Localities: The French Creek Mine, St. Peters, Chester County, Pennsylvania. The Mineralogical Record, 25 (2) 105-120
 
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