Final answer:
The mineral that might scratch fluorite but would not scratch amphibole is brucite.
Step-by-step explanation:
In this case, the mineral brucite would scratch the mineral fluorite, but would not scratch the mineral amphibole.
Brucite has a hardness of 2.5 to 3.5 on the Mohs scale, while fluorite has a hardness of 4. Amphibole, on the other hand, has a hardness of 5 to 6, making it harder than fluorite.
Therefore, brucite would be able to scratch fluorite, but not amphibole.