$(a)$ Baryte,$(b)$ Galena,$(c)$ Zinc blende,and $(d)$ Copper pyrites. How many of these minerals are sulphide-based?

The ore pitchblende is the main source of

$ACl_2$ (excess) + $BCl_2$ $\rightarrow$ $ACl_4$ + $B \downarrow$
$BO \xrightarrow[\Delta]{> 400 \ ^oC} \frac{1}{2} O_2 + B$
If $A$ and $B$ are metals,then the ore of $B$ would be:

What percentage of the Earth's crust by mass is composed of oxygen (in $\%$)?

Argentite is an ore of which of the following?

Which of the following minerals is not an ore of aluminum?