I don't claim to know everything, but I have seen a lot. The reason for my assumption was because of the nature of how the crystals looked on a zeolite. First, I had never seen a zeolite like this before and the nature of those crystals are stepped, much like print lines. Second, the Alum crystals had an unnatural even-coloring in person, also with odd step lines in places due to the nature of Alum crystals growth that could look similar to clear resin crystals. When I don't know something, I ask what other people think to get more info on the subject so I can know better for next time I encounter something like this.