Yes, 1, all sides - octahedral. Dodecahedral Diamonds, Borts, and Carbonado exhibit poor or no cleavage. Source: http://www.minerals.net/mineral/diamond.aspx
YES it does
No. Cleavage is absent in copper and its fracture is jagged.
The cleavage of rose quartz is 2.65
It has both: uneven fracture, and perfect cleavage in three directions.
Yes; Fluorite has cleavage; it breaks along flat surfaces in three directions.
Cleavage is the splitting of rocks or minerals along defined surfaces.
the cleavage of the diamond is nothing
a diamonds cleavage is the cleavage of a diamond
A diamond has four directions of cleavage. You just drop it in whenever appropriate.
You can review the site, below, to view the crystallography of the mineral diamond.
Diamond stone, because of its lattice structure of carbon atoms, is identified as an 'octahedral; perfect and easy' cleavage (according to Wikipedia). Read more, below.
Yes.
Anything can 'break' a diamond should it strike the diamond in its weak spot -- a flaw, because a diamond has perfect cleavage in four directions.
Why is the cleavage of a diamond
Fracture is conchoidal, meaning that diamonds are brittle and when they break, the break does not follow any natural plane of separation.
Diamond, with a hardness rating of 10 on the Mohs scale, is harder than corundum (ruby and sapphire), which has a hardness rating of 9. However, diamond has perfect cleavage while corundum has no cleavage. So an answer to the original question would depend on the meaning of "strong."
Sphalerite
Minerals break in the main two ways cleavage and fracture. Cleavage is breaking in flat planes but fracture is more uneven even unpredictable. The hardest mineral to break would be the diamond, which is placed at a ten on Moh's hardness scale.