What Are Two Properties of a Single Crystal?

[ZedCar]

Homework Statement

In a mock exam I was asked for
Q. Two properties associated with a single crystal.

Homework Equations

The Attempt at a Solution

For one answer I gave that they are hard.



I think another answer might have been something to do with crystal planes as this is what the teacher said when going over the paper again.



I was wondering what this might be? Are crystal planes the same thing as grain boundaries?



Thanks very much.

 

[Rajini]

No, crystal planes is different from grain boundaries..
Is your question is fully written?

 

[ZedCar]

No, crystal planes is different from grain boundaries..
Is your question is fully written?

Thanks Rajini.

Sorry, that was a typo. Have corrected the original question now, which is as it was on the exam.