Fracture is conchoidal, meaning that diamonds are brittle and when they break, the break does not follow any natural plane of separation.
the cleavage is Poor
Sapphire has a mixture of both cleavage and fracture characteristics. It has poor cleavage in one direction and conchoidal fracture, which means it breaks with smooth, curved surfaces similar to glass.
Quartz has a conchoidal fracture. It does not have a cleavage plane.
Silver has neither cleavage nor fracture because it is malleable and ductile, meaning it can be shaped and stretched without breaking along specific planes like cleavage or irregularly like fracture.
Chalcopyrite does not have cleavage. It typically exhibits a conchoidal fracture instead of cleavage planes.
Diamonds typically cleave rather than fracture due to their crystalline structure. Cleavage in diamonds occurs along specific planes, allowing them to break cleanly and predictably. This property is a result of the strong covalent bonds between carbon atoms in their crystal lattice. In contrast, fracture refers to an irregular break, which is less common in diamonds due to their cleavage characteristics.
Quartz does not have cleavage. However, it does have fracture. Its fracture is conchoidal.
it has no cleavage
it has no cleavage
cleavage
Diamonds exhibit cleavage along octahedral planes, which enables them to be cut and shaped with precision. However, if a diamond is struck in the wrong direction or with enough force, it can exhibit fracture rather than cleavage, resulting in damage or breakage.
Fracture
a diamonds cleavage is the cleavage of a diamond
Hematite has a characteristic fracture, meaning it breaks irregularly with rough or jagged edges and no smooth cleavage planes.
the cleavage is Poor
Sapphire has a mixture of both cleavage and fracture characteristics. It has poor cleavage in one direction and conchoidal fracture, which means it breaks with smooth, curved surfaces similar to glass.
It has both: uneven fracture, and perfect cleavage in three directions.