Why does each mineral have its own definite crystalline pattern?

If u make mistakes on a school trip to knotts like standing up on a ride too early and they ask you not to do it again or and if you do it again you will be escorted out will it go on my student record? yes i know it is a dumb question

In the 1400s, portugal’s economy was based on a. industry b. exports c. finance d. trade

What is unusual about the iraq mountains ,in spite of their old age?