(C) Non-Ferrous Minerals
Bauxite is a non-ferrous mineral (used to produce aluminium), so the blank middle box in the flowchart should read Non-Ferrous Minerals.
Source: Chapter 5 (Minerals and Energy Resources), Classification of Minerals
The flowchart classifies minerals into three types: Ferrous (e.g., Nickel/Iron), Non-Ferrous (e.g., Bauxite/Aluminium), and Precious (e.g., Gold). Non-ferrous minerals do not contain iron. Bauxite is the ore of aluminium, making option (C) the only correct fit. Students often confuse non-ferrous with non-metallic — remember: non-ferrous minerals are metallic but lack iron content.