''Minerals occur in igneous and metamorphic rocks.'' Explain the statement with example.
Generated by claude-sonnet-4-6 · 2026-06-15 07:02 · grounding rag
Model Answer
In igneous and metamorphic rocks, minerals occur in cracks, crevices, faults or joints. Smaller occurrences are called veins and larger ones are called lodes. Minerals in liquid/molten and gaseous forms are forced upward through cavities, cool and solidify. Major metallic minerals like tin, copper, zinc and lead are obtained this way.
Source: Chapter 5, Mode of Occurrence of Minerals
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Explanation
- Examiners expect two key terms: veins (smaller) and lodes (larger) — must mention both.
- State the process: molten/gaseous minerals forced upward → cool → solidify.
- Give examples (tin, copper, zinc, lead) — a common 1-mark component of this question.
- Do not confuse with sedimentary rock minerals (beds/layers) — that's a different point entirely.