Yttrocerite is an odd blue/purpley calcium fluoride withyttrium and cerium. In other words, it is weird chemistry and here shows as purple splotches (but richly so!). Mindat lists yttrocerite from this locality as tentative/unverified but reported. Well, apparently we finally have a piece pretty solidly linked to the quarry as I am sure the person owning this at the time would have known better than us today, over 100 years later.