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There is only one true jade and that is Jadeite. Nephrite is called jade because it looks like it but it's a totally different mineral. Wyoming is famous for Nephrite but I hadn't heard of Jadeite...

Are those just names or are those what they are supposed to be made of?

If that's what they are made of you know, onyx is calcium carbonate and pretty soft stuff while the ruby is Aluminum Oxide...