Here's why this is the best description:

* Mohs Hardness Scale: This is the standard scale used to measure mineral hardness.

* 3.5 to 4: This range accurately reflects the typical hardness of dolomite. It means dolomite can be scratched by a steel knife (hardness 5.5) but not by a copper coin (hardness 3).

Additional information:

* Relative Hardness: This means dolomite is relatively hard compared to softer minerals like gypsum (hardness 2) but softer than quartz (hardness 7).

Let me know if you have any other questions about minerals or their properties!