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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Opal from
McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA


Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Comments:Cacholong variety.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view McDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:73231
Long-form Identifier:1:3:73231:2
GUID (UUID V4):0
Nearest other occurrences of Opal
3.0km (1.8 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
3.6km (2.3 miles) ⓘF.J. Marley Quarry, Verona, Essex County, New Jersey, USA
7.1km (4.4 miles) ⓘUpper New Street Quarry, Paterson, Passaic County, New Jersey, USA
17.9km (11.1 miles) ⓘPennsylvania Railroad cut, Mt Pleasant, Bergen Hill, Jersey City, Hudson County, New Jersey, USA
18.7km (11.6 miles) ⓘNew York - West Shore & Buffalo RR tunnel, Weehawken, Bergen Hill, Hudson County, New Jersey, USA
21.9km (13.6 miles) ⓘ106th Street & Central Park West, Manhattan (New York County), New York City, New York, USA
30.2km (18.8 miles) ⓘAllen Mine, Rockaway Township, Morris County, New Jersey, USA
31.4km (19.5 miles) ⓘStirling Brook ("Carnelian Creek"), Warren Township, Somerset County, New Jersey, USA
32.9km (20.5 miles) ⓘMillington Quarry, Bernards Township, Somerset County, New Jersey, USA
33.2km (20.7 miles) ⓘDickerson Mine, Mine Hill, Morris County, New Jersey, USA
References
Mins. of NYC & Its Environs, NY Min. Club (1931), Manchester, J.G.
Peters, Joseph J. (1984) Triassic Traprock Minerals of New Jersey. Rocks & Minerals, 59 (4) 157-183 doi:10.1080/00357529.1984.11764472
 
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