Antigorite (serpentine)
Antigorite: pale green, massive / compact, with waxy or greasy luster

Antigorite {(Mg,Fe)3Si2O5(OH)4} is a mineral of the serpentine group. It occurs in metamorphosed limestone (marble). The massive, pale green variey of antigorite (shown above) is sometimes called "williamsite". I'm not sure whether or not this has anything to do with its occurrence at the old C.K.Williams Quarry near Easton, PA, but it would make sense.

Antigorite can also have a fibrous or striated habit, in which case it is sometimes called "picrolite".

The specimen pictured above was found just outside Phillipsburg, New Jersey in 1998 or 1999.

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