Mineral X is softer than a diamond. If it is scratched by a diamond, it indicates that its hardness is less than that of the diamond, which has a Mohs hardness of 10.
Mineral X is scratched by a diamond. Mineral X _____.
can't be scratched by a penny
has a Mohs hardness of 10
is softer than a diamond
must be a precious metal
1 answer