Corundum has a basal cleavage, meaning it cleaves parallel to its basal plane. This cleavage is often poor and can be difficult to observe.
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.
Corundum has a basal cleavage, meaning it cleaves parallel to its basal plane. This cleavage is often poor and can be difficult to observe.
Quartz does not have cleavage. However, it does have fracture. Its fracture is conchoidal.
it has no cleavage
it has no cleavage
cleavage
Fracture
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.
THE EIGHT WAYS TO I.D. A MINERALThe eight ways to identify a mineral such as corundum are 1 hardness 2 crystal shape 3 special features 4 density 5 streak 6 luster 7 cleavage or fracture 8 color. (to find out hardness look up "Mohs scale of hardness" everything else you could search it on google or bing)
It has both: uneven fracture, and perfect cleavage in three directions.
It has both cleavage and fracture.