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
Allen Mine, Rockaway Township, Morris County, New Jersey, USA


Locality type:Mine
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Allen Mine, Rockaway Township, Morris County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:70877
Long-form Identifier:1:3:70877:7
GUID (UUID V4):0
Nearest other occurrences of Opal
6.2km (3.8 miles) ⓘDickerson Mine, Mine Hill, Morris County, New Jersey, USA
12.0km (7.4 miles) ⓘLowrance Mine, Netcong, Morris County, New Jersey, USA
15.5km (9.6 miles) ⓘBEMCO prospect (Charlotte Mine), Cranberry Lake, Byram Township, Sussex County, New Jersey, USA
18.7km (11.6 miles) ⓘSterling Hill, Ogdensburg, Sussex County, New Jersey, USA
22.0km (13.7 miles) ⓘBuckwheat dump mineral collecting site, Franklin Mine, Franklin, Sussex County, New Jersey, USA
26.7km (16.6 miles) ⓘMillington Quarry, Bernards Township, Somerset County, New Jersey, USA
29.7km (18.4 miles) ⓘF.J. Marley Quarry, Verona, Essex County, New Jersey, USA
30.0km (18.7 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
30.2km (18.8 miles) ⓘMcDowell's Quarry (Osborne and Marsellis Quarry), Upper Montclair, Montclair, Essex County, New Jersey, USA
31.3km (19.5 miles) ⓘStirling Brook ("Carnelian Creek"), Warren Township, Somerset County, New Jersey, USA
References
NJ State Geol. Ann. Rpt (1856):197.
The Iron Mines of NJ (1910), Bayley:404.
 
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