Discussion
Quartz breaks with a conchoidal fracture rather than cleaving because its structure is a
Answer: A
Correct answer: framework of tetrahedra bonded equally in all directions
Cleavage requires planes of weaker bonding, and in quartz every oxygen is shared between two tetrahedra so the silicon-oxygen bonds run in all directions with equal strength. There is no weak plane for a break to follow, so a fracture takes the shell-like conchoidal form instead - the same reason flint and glass break as they do.
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