When my son was in 2nd grade, I volunteered to bring a science demonstration to his class each week, and the kids began calling me "Science Mom." I've been sharing science demonstrations with elementary classrooms ever since.
You don’t really need a Tumblr to polish your rocks. I do it by hand with different grits of sandpaper admittedly, the softer stones are much easier, but you can do it with any stone and if you’re using it as a gift to a friend or family member doing it by hand, makes it more personal.
I have been an avid rockhound since childhood. All things pertaining to geology and especially paleontology, fascinate me. When I was younger, fossils were my big passion, but now I am adding things like peacock copper, agates, quartz, desert rose, etc. to my collection. I think it is the combination of the aesthetic beauty and the scientific information that attracts me. My uncle was also a collector and did lapidary work, which I have never done as I am not good with my hands.