Originally posted by SteveR
Iron oxide afterall! Oxygen!
Are there small amounts in the lunar atmosphere?
Iron Oxide can be formed in volcanos It does not need an oxygen atmosphere
Quartz Mica and Feldspar are the three main minerals in granite which make up a lot of rock on earth...
Quartz is silcon dioxide {oxygen again

} quartx erodes and becomes sand... all the sand on earth is mostly quartz ie silicon dioxide. Go look at
any Lava flow on earth you will see iron oxide
You will find that most rocks have oxygen in the formula and MANY have the hydroxyl radical in the formula and guess what Those break down and form
water
As to zinc it is highly unusual to find that in magma as zinc burns at low temperatures...