Ore of a metal $\mathrm{M}\left(\mathrm{X}\right)\stackrel{ \mathrm{roasting}}{\to }$Roasted ore $\underset{\text{ absence of }{\mathrm{O}}_2}{\stackrel{ }{\stackrel{\mathrm{\Delta }\text{ with }\left(X\right)}{\to }}}$Metal $\mathrm{M}$

Ore of same metal $\mathrm{M}\left(\mathrm{Y}\right)\stackrel{\mathrm{calcination} }{\to }$Calcinated  ore $\underset{\text{ absence of }{\mathrm{O}}_2}{\stackrel{ }{\stackrel{\mathrm{\Delta }\text{ with }\left(X\right)}{\to }}}$ Metal $\mathrm{M}$

Select correct option.

Chalcocite is roasted to form Malachite

Due to limited resources and insufficient metallurgical recovery, malachite, which is created by the surface weathering process of copper ore, is often not employed for copper extraction. The crystal system has contact or penetration twinning, flawless cleavage, and is monoclinic.

Hence, option D is correct.