I can conclude that the mineral that the scientist found is harder than chalcopyrite, pyrite, and orthoclase, but not harder than quartz. I can also conclude that the unknown mineral is a relatively hard mineral.

Question

Which ideas did you include in your answer? Check all that apply.

The unknown mineral is harder than the minerals that it was able to scratch.
The unknown mineral is not harder than the mineral that it was not able to scratch.
The unknown mineral is a relatively hard mineral.

Answer 1

Based on your answer, the ideas you included are:

1. The unknown mineral is harder than the minerals that it was able to scratch. (This is implied, as you mentioned it is harder than chalcopyrite, pyrite, and orthoclase.)
2. The unknown mineral is not harder than the mineral that it was not able to scratch. (This is implied because you stated it is not harder than quartz.)
3. The unknown mineral is a relatively hard mineral. (You've explicitly stated this.)

So, all three ideas apply to your conclusion.