Identify the mineral which has specific gravity > 5, hardness <...
Galena is the most common mineral containing lead.
Color - Steel-gray
Streak - Steel-gray
Hardness - 2.5 - 3
Specific Gravity - 7.4 - 7.6
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Identify the mineral which has specific gravity > 5, hardness <...
Identifying the Mineral with Specific Gravity 5, Hardness 3, and Grey Streak
To identify the mineral with specific gravity 5, hardness 3, and a grey streak, we need to analyze the given options and compare their properties with the given information. Let's examine each option and determine the correct mineral.
Option A: Barite
- Specific Gravity: Barite has a specific gravity ranging from 3.5 to 4.5, which is lower than the given value of 5.
- Hardness: Barite has a hardness of 3 to 3.5, which matches the given value.
- Streak: Barite typically has a white streak, not a grey streak.
Option B: Sphalerite
- Specific Gravity: Sphalerite has a specific gravity ranging from 3.9 to 4.1, which is lower than the given value of 5.
- Hardness: Sphalerite has a hardness of 3.5 to 4, which is slightly higher than the given value.
- Streak: Sphalerite usually has a brown streak, not a grey streak.
Option C: Graphite
- Specific Gravity: Graphite has a specific gravity ranging from 1.9 to 2.3, which is significantly lower than the given value of 5.
- Hardness: Graphite has a hardness of 1 to 2, which is lower than the given value.
- Streak: Graphite has a black streak, not a grey streak.
Option D: Galena
- Specific Gravity: Galena has a specific gravity of approximately 7.4, which is higher than the given value of 5.
- Hardness: Galena has a hardness of 2.5, which is lower than the given value.
- Streak: Galena has a grey streak, which matches the given information.
Conclusion:
Based on the analysis of the given options, it can be determined that the mineral with a specific gravity of 5, hardness of 3, and a grey streak is Galena (Option D).