In an hexagonal crystal

In a hexagonal crystal:

What is the shpae of tthe unit cell of a cubic and a hexagonal crystal system?

(A) There are seven types of crystal system and 14 types of Bravias lattices. (R) Rhombohedral ,triclinic and hexagonal crystal systems have only primitive unit cell.

Tourmaline is a hexagonal crystal. The longest diagonal of the crystal is known as______ [Fill in the blank.]

Consider the following statements, I. Possibe variations for a cubic crystal system is primitive only II. The axial angles of a hexagonal crystal system are alpha=beta=90^@ " and " gamma = 120^@ . Which of the above statements(s) is / are true ?

Which of the following is an exzmple of hexagonal Crystal System ?

The number of octahedral and tetrahedral holes respectivley present in a hexagonal close packed crystal of 'X' atoms are