Question:
Which of the following is not a diagnostic mineral property?
Which of the following is not a diagnostic mineral property?
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Streak is usually more reliable than colour for mineral identification.
Updated On: May 19, 2026
- Hardness
- Lustre
- Streak
- Colour
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The Correct Option is D
Solution and Explanation
Concept:
Diagnostic mineral properties help in the identification of minerals. Some properties are more reliable than others.
Step 1: Reliable diagnostic properties.
Hardness, lustre and streak are commonly used for mineral identification. \[ \text{Hardness, Lustre, Streak} \Rightarrow \text{useful diagnostic properties} \]
Step 2: Why colour is less reliable.
Colour may vary due to impurities, weathering or defects in the mineral. For example, quartz may occur in many colours.
Step 3: Final answer.
Because colour is not always reliable for diagnosis, it is not considered a strong diagnostic property in this context. \[ \therefore \text{Correct Answer is (D)} \]
Diagnostic mineral properties help in the identification of minerals. Some properties are more reliable than others.
Step 1: Reliable diagnostic properties.
Hardness, lustre and streak are commonly used for mineral identification. \[ \text{Hardness, Lustre, Streak} \Rightarrow \text{useful diagnostic properties} \]
Step 2: Why colour is less reliable.
Colour may vary due to impurities, weathering or defects in the mineral. For example, quartz may occur in many colours.
Step 3: Final answer.
Because colour is not always reliable for diagnosis, it is not considered a strong diagnostic property in this context. \[ \therefore \text{Correct Answer is (D)} \]
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