A. Cannot be scratched by a copper penny but can be scratched by an
ordinary pocket knife
Fluorite White Cleavage in 4 4
directions can
give fragments
that are shaped
like octahedrons;
crystals commonly
cubes
B. Cannot be scratched by an ordinary pocket knife but can be scratched
by quartz
Quartz, variety: White Curved, 7
amethyst conchoidal
fracture;
_amethyst_
crystals commonly
6-sided prisms
with pyramid-like
ends