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Topaz is number 8 on the Mohs scale.
The softest material in the mohs scale is talc
A steel file can scratch minerals with a hardness of 6.5 or lower on the Mohs scale. This includes minerals such as gypsum, calcite, and fluorite.
The hardness of the mineral pyrite, or Fool's Gold, is about 6 on the Mohs hardness scale. That's a little harder than a steel knife blade, but not as hard as the mineral quartz
Limonite has a hardness of about 4 to 5.5 on the Mohs hardness scale.