Thank you. Everyone says this is a tough term to grasp but it really is just poorly explained for sure. Two different teachers, in their lectures went over it but made no sense at all. This was very easy to understand.
For example : There is a family of stones called corundum which has no cleavage. It means that all sapphires and rubies have no cleavage, either. You don’t have to test or to destroy them to know that.
I couldn't really see the staircase thing Does he refer to the shape of the actual saircase we walk on ? I know it sounds weird but English is not my first language so I'm thinking if (staircase) is a another term in mining science or something since I couldn't observe the staircase pattern he was talking about
