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
Gap Mine, Bart Township, Lancaster 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
Data
Mineral Data:Click here to view Actinolite data
Locality Data:Click here to view Gap Mine, Bart Township, Lancaster County, Pennsylvania, USA
Data Identifiers
Mindat Occurrence Record ID:65801
Long-form Identifier:1:3:65801:0
GUID (UUID V4):0
Nearest other occurrences of Actinolite
26.6km (16.5 miles) ⓘSylmar, West Nottingham Township, Chester County, Pennsylvania, USA
27.0km (16.8 miles) ⓘSilver Hill Quarry, Bowmansville, Brecknock Township, Lancaster County, Pennsylvania, USA
29.1km (18.1 miles) ⓘWiant's Quarry (Weiant Quarry), Pilot, Cecil County, Maryland, USA
29.3km (18.2 miles) ⓘGrace Mine, Morgantown, Berks County, Pennsylvania, USA
31.1km (19.3 miles) ⓘJones mine, Caernarvon Township, Berks County, Pennsylvania, USA
31.4km (19.5 miles) ⓘKeystone Trap Rock Quarry, Cornog, Wallace Township, Chester County, Pennsylvania, USA
33.8km (21.0 miles) ⓘHopewell mine, Hopewell Mines, Warwick (Saint Marys), Warwick Township, Chester County, Pennsylvania, USA
34.4km (21.4 miles) ⓘMaryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry), Cardiff, Harford County, Maryland, USA
40.0km (24.9 miles) ⓘFrench Creek Mines, Saint Peters, Warwick Township, Chester County, Pennsylvania, USA
40.8km (25.4 miles) ⓘOsborne Hill, Birmingham Township, Chester County, Pennsylvania, USA
References
Dana 6:1069
Dana 7:I:235,241 & II:490.
(1990) Lawrence H. Conklin Mineral List, in Twentieth Anniversary Issue. The Mineralogical Record, 21 (1) 102-105
 
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