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This chart is the Moh's Hardness Scale. This is a scale that shows how hard a mineral is. This scale is often used hand and hand with the scratch test. The lower the number on the scale the mineral is, the more things can scratch it.
Now, the mineral Sphalerite has a hardenss of about 3.5-4. Meaning, depending on how hard it really ends up being, it will be on the lower end of the hardness scale.
If it was at the 3.5 hardness:
it would be able to be scratched by anything over the 3.5 hardness. Including a copper coin. It would be between the hardness of Calcite and Fluorite.
If it was at the 4.0 hardness:
It would be able to be scratched by anything over the 4.0 hardness. Including a steel file. It would be about the hardness of Fluorite.
Now, the mineral Sphalerite has a hardenss of about 3.5-4. Meaning, depending on how hard it really ends up being, it will be on the lower end of the hardness scale.
If it was at the 3.5 hardness:
it would be able to be scratched by anything over the 3.5 hardness. Including a copper coin. It would be between the hardness of Calcite and Fluorite.
If it was at the 4.0 hardness:
It would be able to be scratched by anything over the 4.0 hardness. Including a steel file. It would be about the hardness of Fluorite.
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