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
Mineral Hill Mine, Louisville, Carroll County, Maryland, USA


07176170017272734065080.jpg
Actinolite

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
08057150017272033708456.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
00495920017272033722846.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
07454930017366237345813.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
04537550017363135214706.jpg
Actinolite

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
07438160017363135219115.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
01382680017363135228219.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
07454930017366237345813.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
07176170017272734065080.jpg
Actinolite

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
08057150017272033708456.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
06701750017272040724981.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
03953840017366237353577.jpg
Actinolite, etc.

Mineral Hill Mine, Louisville, Carroll 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
Associated Minerals Based on Photo Data:
Talc8
Epidote6
Chalcopyrite5
Amphibole Supergroup5
Calcite4
Magnetite3
Tenorite3
Malachite3
Siderite3
Pyrite2
Carrollite2
Siegenite2
Data
Mineral Data:Click here to view Actinolite data
Locality Data:Click here to view Mineral Hill Mine, Louisville, Carroll County, Maryland, USA
Photo GalleryView Gallery (6 photos)
Data Identifiers
Mindat Occurrence Record ID:98186
Long-form Identifier:1:3:98186:6
GUID (UUID V4):0
Nearest other occurrences of Actinolite
7.1km (4.4 miles) ⓘPatapsco Mine (Finksburg Mine; Orchard Mine), Patapsco Mines, Finksburg, Carroll County, Maryland, USA
7.5km (4.6 miles) ⓘBornite pit, Springfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
7.6km (4.7 miles) ⓘSpringfield Mine (Mr. Tysons Mine; Sykesville Mine), Sykesville, Carroll County, Maryland, USA
8.1km (5.1 miles) ⓘMarriottsville Talc Quarries, Carroll County, Maryland, USA
8.7km (5.4 miles) ⓘCarroll Mine, Sykesville, Carroll County, Maryland, USA
9.3km (5.8 miles) ⓘOursler Talc Quarries, Carroll County, Maryland, USA
15.2km (9.5 miles) ⓘFrost Quarry, Davis, Howard County, Maryland, USA
18.1km (11.2 miles) ⓘBok Asbestos Mine, Hollofield, Baltimore County, Maryland, USA
18.9km (11.7 miles) ⓘPatapsco Glen Construction Site, Woodlawn, Baltimore County, Maryland, USA
23.7km (14.7 miles) ⓘBare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore County, Maryland, USA
References
Rocks & Min.:26:111,121.
Econ Geol (1989) 84:663-675
 
and/or  
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