Which of the following is NOT an essential property of a mineral?
Show Hint
- Natural occurrence
- Regular internal structure
- Fixed composition
- Solid state
The Correct Option is C
Solution and Explanation
Step 1: Essential properties of minerals.
A mineral is defined as:
- Naturally occurring,
- Solid,
- Inorganic,
- With an ordered internal structure (crystalline),
- Having a definite but not necessarily fixed chemical composition.
Step 2: Key clarification.
The composition of many minerals is not strictly fixed but varies within limits due to solid solution (e.g., plagioclase: Albite–Anorthite series).
Step 3: Conclusion.
Thus, "fixed composition" is not an essential property; instead, "definite composition within a range" is correct.
Final Answer:
\[
\boxed{\text{Fixed composition}}
\]
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