See also: Cleavage (homonymy)
The cleavage is the property of a mineral to a rupture.
The place where one can cleave calls a plane cleavage, which is in the direction of the Liaison S between the Atome S which are more Faible S.
Cleavage often makes the stones difficult to cut. Indeed, the plans of cleavage are sometimes very difficult to distinguish, and that can break the stone at the time to cut it.
One distinguishes various degrees from cleavage following minerals:
- Excels - the mineral is cleaved out of fines Lamelle S: Graphite, Gypsum, Muscovite.
- Perfect - the mineral is cleaved in regular forms delimited by the plans of cleavage: Calcite, Crystal, Halite.
- Good - the plans of cleavage are not perfectly right: Feldspar, Pyroxene.
- Imperfect - cleavage is not Net: Sulfur, Apatite, Cassiterite.
- Bad - not about cleavage, one speaks then about break.
The break is:
- Conchoïdal E (Opal, quartz).
- Unequal (Pyrite).
- Rough (money, Gold).
- Friable (Garnet-red Nephritis, ).
- Earthy (Aluminate, Kaolinite).
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