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What is the main ore of mercury ? How is...

What is the main ore of mercury ? How is mercury obtained from this ore ?

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The main ore of mercury is cinnabar (HgS). Mercury is obtained from it by heating with excess of air or oxygen.
`underset("Mercuric sulphide")(2HgS(s))+ 3O_(2)(g) overset("heat")rarr underset("Mercuric oxide")(2HgO(s))+ 2SO_(2)(g)`
`2HgO(s) overset("heat")rarr 2Hg(l) + O_(2) (g)`
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