The situation now is that I don't currently have any shoes that I'd feel good walking around all day long in...not the way we like to walk. I have good running shoes, but I really don't feel like wearing those on a trip to Europe. This is asking way early - but if it takes me a few tries to find the right shoes, I'd rather get that sorted out sooner, rather than later.
Selenite is a variety of the mineral gypsum, which has a chemical formula of calcium sulfate dihydrate.The dihydrate part of that formula indicates that each unit has two molecules of water attached to it.elenite is a variety of the mineral gypsum, which has a chemical formula of calcium sulfate dihydrate.
Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust.