Cleavage in graphite occurs parallel to its basal plane, resulting in thin, planar sheets being formed. Mica, on the other hand, cleaves into thin, elastic sheets parallel to its basal plane due to its layered structure.
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.
cobalt has cleavage( breaks along clean plains)
Quartz lacks cleavage because it does not have any preferred planes of weakness along which it can split. It has a crystalline structure with equally strong bonds in all directions, making it fracture along irregular surfaces instead of cleaving in a predictable manner.
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.
graphite breaks by cleavage because the bonds between its atoms are less strong in directions
graphite is a basal cleavage
cleavage....
...directions of cleavage...
Diamond has perfect cleavage in four directions, fluorite has perfect cleavage in four directions, sodalite has perfect cleavage in three directions, and sphalerite has perfect cleavage in six directions.
Two directions of cleavage, at 90 degrees to each other.
Cleavage in graphite occurs parallel to its basal plane, resulting in thin, planar sheets being formed. Mica, on the other hand, cleaves into thin, elastic sheets parallel to its basal plane due to its layered structure.
Cobalt has perfect cleavage in all directions.
Cleavage in two directions, one good, one distinct.
The minerals known for perfect cleavage in three directions are calcite, halite, and fluorite. These minerals exhibit cleavage in three directions that are perpendicular to each other, resulting in the formation of cubic or rhombohedral shapes.
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.