The unit cell of amazonite is made of three pairs of faces, each pair different from the others. the faces are oriented at angles to one another that are not 90 degrees. what type of crystal system is this?
hexagonal

orthorhombic

rhombohedral

triclinic

The unit cell of amazonite is made of three pairs of faces, each pair different from the others. The faces are oriented at angles to one another that are not 90 degrees. The type of crystal this is is triclinic.
Triclinic crystal system is one of the seven crystal systems, with three basis vectors. 

A) the enthralling of formation for pure element in its standard state is always positivehope this : )