Identify the metalliferous mineral among the list\nWhich of the following is NOT a non-metalliferous (i.e., is a metalliferous) mineral?

Introduction / Context:
Minerals are commonly grouped as metalliferous (ore minerals yielding metals) and non-metalliferous (industrial, non-metallic minerals). Correct classification matters in beneficiation method selection and market segmentation (e.g., metal recovery vs. filler/flux applications).

Given Data / Assumptions:

• Non-metalliferous examples include common industrial minerals like calcite, fluorspar, quartz, and barite.
• Metalliferous ore minerals include those like cassiterite (SnO2), the primary ore of tin.

Concept / Approach:
Calcite (CaCO3), quartz (SiO2), fluorspar (CaF2), and barite (BaSO4) are industrial minerals used as fillers, fluxes, or chemicals; they do not directly yield base or precious metals. Cassiterite is a tin oxide mineral mined specifically for metal extraction. Therefore, it is metalliferous and not part of the non-metalliferous category.

Step-by-Step Solution:

Verification / Alternative check:
Mineralogy references list cassiterite as the principal tin ore; the others are sold as industrial minerals.

Why Other Options Are Wrong:

• Calcite/fluorspar/quartz/barite are non-metallic, used industrially, not to extract metals directly.

Common Pitfalls:
Confusing “fluorspar” with fluorine as a metal—fluorine is a halogen element; fluorspar is a non-metallic mineral.

Final Answer:
Cassiterite