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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Sillimanite from
Shiloh, Frelinghuysen Township, Jenny Jump Mountain, Warren County, New Jersey, USA


Classification
Species:Sillimanite
Formula:Al2(SiO4)O
Comments:Occurs in Precambrian Franklin marble.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Sillimanite data
Locality Data:Click here to view Shiloh, Frelinghuysen Township, Jenny Jump Mountain, Warren County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:70757
Long-form Identifier:1:3:70757:4
GUID (UUID V4):0
Nearest other occurrences of Sillimanite
11.9km (7.4 miles) ⓘHoit Mine, White Township, Warren County, New Jersey, USA
25.5km (15.8 miles) ⓘMase Mountain, Tierneys Corner, Jefferson Township, Morris County, New Jersey, USA
30.0km (18.6 miles) ⓘSterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
32.3km (20.1 miles) ⓘCopper Mine shaft, Edison Mine, Sparta Township, Sussex County, New Jersey, USA
39.3km (24.4 miles) ⓘHamburg Mountain, Hardyston Township, Sussex County, New Jersey, USA
44.0km (27.3 miles) ⓘPochuck Mountain, McAfee, Vernon Township, Sussex County, New Jersey, USA
74.8km (46.5 miles) ⓘVillage of Monroe, Town of Monroe, Orange County, New York, USA
77.8km (48.4 miles) ⓘWorld Trade Center Site, Manhattan (New York County), New York City, New York, USA
89.3km (55.5 miles) ⓘCrugers Emery Mine, Montrose, Cortlandt Township, Westchester County, New York, USA
91.0km (56.6 miles) ⓘPeekskill, Westchester County, New York, USA
References
NJ State Geol. Ann. Rpt. (1895):51.
 
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