Larger: Oxygen spray bottles. I'm sure there's real oxygen in here, I just don't know why. Sure, breathing pure oxygen can be refreshing, if it doesn't make you dizzy, but a lightweight aerosol bottle like this can't contain enough to make any real difference.
Refractory: Refractory, any material that has an unusually high melting point and that maintains its structural properties at very high temperatures. Composed principally of ceramics, refractories are employed in great quantities in the metallurgical, glassmaking, and ceramics industries, where they are formed
As described in the section on "fake jades", many minerals (especially green ones!) are sometimes described and sold as jade but are not, in fact jade.This page goes into more detail about the minerals and substances that are not jade, and offers suggestions for how to differentiate it from true jade.