Thank you for posting the pictures. The first 2 certainly look like amethyst. The middle one that is round and frosted indeed looks like glass. The last one looks like the diopside in wollastonite or calcite from upstate ny in the Adirondack Region (i.e. keene or willsboro). That type of material doesn't exist in the central part of the state where Auburn is, so its likely been transported. See if you can find others and describe its origination. Hope this information is helpful.