According to the scale of mineral hardness, the unkown mineral is harder than dolomite and tellurite. The unknown mineral scratches tellurite.
The Mohs scale is a qualitative description of mineral hardness. It characterizes minerals according to their resistance to being scratched.
Harder minerals can produce marks on the less hard ones.
The scale was defined using 10 different minerals. Diamond is the hardest one, while talc is the least hard.
According to this scale, a diamond can scratch all the other minerals because it is the hardest one, but can not be scratched by any of the other 9.
On the other hand, talc can not make a mark on any of them, but all of them can mark it.
Following this scale, many other mineral can be added to the list.
According to the Mohs scale,
Mineral Hardness level
If the unkown mineral can scratch dolomite, it is because it is harder. So the Hardness level of this unkown mineral > 4.
Tellurite is the least hard of the three minerals, so it would be scratched by the unkown mineral.
You can learn more about the Mohs scale at
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