Cleavage refers to the tendency of a mineral to break along flat surfaces. Graphite and mica have the same type of cleavage, which is a perfect basal cleavage.
Cobalt has a cleavage in three directions, forming a cube.
A short answer is:GraphiteA longer answer is:There are many minerals that break along flat surfaces. Probably the one that you would be most familiar with is "graphite". Graphite is a mineral formed from carbon atoms and it is used to make up the lead in pencils.Because of the structure of graphite, it tends to break cleanly in parallel, "flat" surfaces. It is not as evident in a pencil, because the piece of graphite is so small, but if you had a very large piece of graphite and broke it, you would see it break into flat flakes or plates.
Because of its lattice structure, diamond has four directions of perfect cleavage along its crystal orientation plane (e.g. 111, 110, etc.) forming octahedrons.Fracture is conchoidal, meaning that diamonds are brittle and when they break, the break does not follow any natural plane of separation.
Cleavage is smooth; Fracture is rough. Cleavage splits along flat surfaces; Fracture splits along jagged surfaces. Cleavage is Cleavage; Fracture is Fracture
graphite breaks by cleavage because the bonds between its atoms are less strong in directions
cleavage....
graphite is a basal cleavage
Cleavage refers to the tendency of a mineral to break along flat surfaces. Graphite and mica have the same type of cleavage, which is a perfect basal cleavage.
Two directions of cleavage, at 90 degrees to each other.
...directions of cleavage...
Cobalt has perfect cleavage in all directions.
Cleavage in two directions, one good, one distinct.
Graphite
it probably break apart with cleavage, because the carbon atoms in graphite from sheets that could split apart easily in layers.
It has both: uneven fracture, and perfect cleavage in three directions.
splits in two directions