Black Jack is an ore of

Which of the following is a carbonate ore?

Refractory metals are used in the construction of furnaces because:

Which of the following aluminum minerals does not contain oxygen?

Select the correct option using $T$ (True) or $F$ (False) for the following statements:
$(1)$ $A$ mineral cannot be an ore.
$(2)$ An ore cannot be a mineral.
$(3)$ All minerals are ores.
$(4)$ All ores are minerals.

Define the following terms:
$(i)$. Minerals
$(ii)$. Ores
$(iii)$. Metallurgy
$(iv)$. Gangue