✍️Activity 3A: Assessing Hardness Values of Minerals
- Due Mar 14, 2021 at 11:59pm
- Points 12
- Questions 12
- Available after Mar 8, 2021 at 12am
- Time Limit None
- Allowed Attempts 2
Instructions
Materials Needed
- Mineral kit. This will contain unnumbered samples; use the Mineral Index to order your samples by number.
- Hardness kit:
- Your fingernail
- A copper plate
- Glass plate
- Steel nail
- Streak plate (unglazed porcelain)
- Hand lens or magnifying glass (at minimum 10x). How do I use a hand lens? Hold it very close to your eye and bring the sample near the lens until it is in focus.
Recall, hardness is the scratching resistance of a mineral. You will need to determine if the mineral is harder or softer than the common material (Table 3.1). Use greater than (>) or less than (<) symbols to indicate the approximate hardness. For example, if your fingernail scratches your sample, look and feel for a gouge or groove in the sample, this sample would represent a hardness value of less than 2.5 (H<2.5).
You will use minerals 9, 5, and 6 for this Activity. Refer to Table 3.1 for guidance.
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