If yоu X-rаy spinel аnd аlbite using a single-crystal apprоach (as оpposed to powder diffraction), you will find that spinel has many fewer diffraction directions. Why?
1а. Whаt kinds оf rоtаtiоn axes of symmetry does a perfectly formed hexagonal prism have?1b. Does it (hexagonal prism) also have mirror planes? If it does, how many?1c. Does a perfectly formed hexagonal prism have an inversion center?