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.
A selenide is a chemical compound containing a selenium anion with oxidation number of â2 (Se2â), much as sulfur does in a sulfide. The chemistry of the selenides and sulfides is similar. Similar to sulfide, in aqueous solution, the selenide ion, Se2â, is prevalent only in very basic conditions.