This is a classic old Massachusetts specimen, of a kind found only seldom now in old museum collections and older personal collections. I am told that these sharp crystals are actually caught in altering (or altered fully to) a mix of muscovite and albite. This is a stark, aesthetic, display sized specimen with really nice geometry to it. While I do not know an exact locale on this, it is most likely, but not 100% sure from the Goshen Area, with references from Emerson (thanks to Jim Chenard for looking this up in the old books)