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
Bare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore County, Maryland, USA


Locality type:Mine
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 Bare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:150375
Long-form Identifier:1:3:150375:3
GUID (UUID V4):0
Nearest other occurrences of Actinolite
0.8km (0.5 miles) ⓘDiscovery workings (Main workings), Bare Hills, Baltimore County, Maryland, USA
12.1km (7.5 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
12.5km (7.8 miles) ⓘBok Asbestos Mine, Hollofield, Baltimore County, Maryland, USA
18.0km (11.2 miles) ⓘFrost Quarry, Davis, Howard County, Maryland, USA
21.2km (13.2 miles) ⓘMarriottsville Talc Quarries, Carroll County, Maryland, USA
22.1km (13.7 miles) ⓘPatapsco Mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Carroll County, Maryland, USA
22.2km (13.8 miles) ⓘOursler Talc Quarries, Carroll County, Maryland, USA
23.7km (14.7 miles) ⓘMineral Hill Mine, Louisville, Carroll County, Maryland, USA
26.0km (16.1 miles) ⓘCarroll Mine, Sykesville, Carroll County, Maryland, USA
26.6km (16.5 miles) ⓘBornite pit, Springfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
References
Rocks & Min.: 21:144-145
Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.p.27
 
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