Jeffersonite
Passaic pit, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
This specimen is actually quite attractive for this augite varietal that has some aesthetics of geometry to it. It is sharply doubly-terminated, and not cracked and pasty as these tend to get. Jeffersonite is a zincian manganoan variety of augite, a clinopyroxene. Originally described from Passaic Pit (Marshall Mine; Passaic Mine), Sterling Hill, ...
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