Select the TWO OPTIONS which are correct based on the figures below and your knowledge from
the Earth materials lab.
A. Figure A represents the mineral diamond, with low hardness in the Mohs scale. This low hardness is due to
the weak bonds between the sheets holding on only by the weak Van der Waals forces. The covalent
bonding between the carbon atoms in the sheets is stronger holding the sheets together when you rub the
mineral.
B. Figure A represents the mineral graphite, with low hardness in the Mohs scale. This low hardness is due to
the weak bonds between the sheets hold only by Van der Waals forces. The covalent bonding between the
carbon atoms in the sheets is stronger holding the sheets together.
C. Figure B represents the mineral diamond which has high hardness in the Mohs scale due to the strong bonds
between the carbon atoms forming a three dimensional network.
D. Figure B represents the mineral diamond which has low hardness in the Mohs scale due to the strong bonds
between the carbon atoms forming a three dimensional network.