Oxygen

• Up: Chemical element

Oxides

(TODO: discuss major ones here)

Carbon group / group IV / group 14 oxides

• CO₂ normally the well known gas but highly explosive when in solid sp3 form (analog to quartz)
• SiO₂ quartz and its various known polymorphs (~Mohs 7)
• GeO₂ argutite Mohs 6-7 -- germanium is a rather rare element!
• SnO₂ cassierite Mohs 6-7
• PbO₂ [1] -- alpha-PbO₂ scrutinyite -- beta-PbO₂ plattnerite (TODO: find out Mohs hardness of PbO₂ minerals)

(All those have rutile structure. See page about silicon.)
(TODO: Here maybe some pseudo phase diagrams can be made.)

Related

• Oxygen is the most abundant element on Earth (crust on surface). It's roughly on par with iron when looking at the whole Earh including the inaccessible interior. (The whole earth average may be a good representation of the elements distribution in the better accessible asteroid belt).
• Salts of oxoacids
• Hydroxides
• Binary diamondoid compounds

External links

• Unstable oxygen chain polymers: Hydrogen polyoxides (Wikipedia)
• Maybe of relevance: Surface properties of transition metal oxides (Wikipedia)