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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Antigorite from
Maryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry), Cardiff, Harford County, Maryland, USA


Locality type:Quarry
Classification
Species:Antigorite
Formula:Mg3(Si2O5)(OH)4
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Antigorite data
Locality Data:Click here to view Maryland Green Marble Corporation Quarry (Cardiff Serpentine Quarry), Cardiff, Harford County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:850809
Long-form Identifier:1:3:850809:6
GUID (UUID V4):0
Nearest other occurrences of Antigorite
9.1km (5.6 miles) ⓘCherry Hill Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
14.4km (8.9 miles) ⓘLine pit (Lowe's Chromite Mine), Fulton Township, Lancaster County, Pennsylvania, USA
14.4km (8.9 miles) ⓘLine pit (Lowe's Mine), Cecil County, Maryland, USA
15.1km (9.4 miles) ⓘRock Springs Iron Mine, Fulton Township, Lancaster County, Pennsylvania, USA
15.2km (9.5 miles) ⓘRed Pit Mine, Fulton Township, Lancaster County, Pennsylvania, USA
15.6km (9.7 miles) ⓘJenkins Mine (Jenkins Corner; North Rock Springs), Fulton Township, Lancaster County, Pennsylvania, USA
15.6km (9.7 miles) ⓘReed Mine, Jarretsville-Dublin Mining District, Harford County, Maryland, USA
16.0km (9.9 miles) ⓘWilkins Mine (Wilkens Mine; John W. Carman Property), Jarretsville-Dublin Mining District, Harford County, Maryland, USA
16.5km (10.2 miles) ⓘHaines & Kibblehouse Penn-Maryland Materials Quarry, Fulton Township, Lancaster County, Pennsylvania, USA
17.3km (10.8 miles) ⓘCedar Hill Quarry (Stoltzfuss Quarry), Fulton Township, Lancaster County, Pennsylvania, USA
References
Ostrander, Charles W., Price, Jr, Walter E. (1940) Minerals of Maryland. The Natural History Society of Maryland, Baltimore, Maryland, USA. 14pp.
Pearre, N. C.; Van Heyl, A. (1960) Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware. Bulletin 1082k. US Geological Survey doi:10.3133/b1082k pp.233-246
 
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