Yttrofluorite is defined as fluorite (CaF2), where the rare earth element yttrium replaces some of the calcium atoms, and therefore has...

As mentioned in a previous post, I enjoyed a recent business trip to Israel. Fortunately for me, the original hotel where I was to stay...

Israel is not known for it's fluorescent rocks. Or really any rocks at all, as laws apparently prevent collecting samples to sell (with...