11. There are three vectors of unequal length in this crystal system . 12. Barytocalcite crystallizes in the monoclinic crystal system , typically as massive to prismatic crystals. 13. Normally this would form a monoclinic crystal system of zirconium oxide. 14. Its hardness is 3.5 and crystallizes in the monoclinic crystal system . 15. It crystallizes in the cubic crystal system often showing octahedral forms. 16. The hexagonal crystal family consists of two crystal systems : trigonal and hexagonal. 17. The approximation generally holds for face-centered and body-centered cubic crystal systems . 18. Beraunite crystallizes in the monoclinic crystal system with point group 2 / m. 19. It has a conchoidal, uneven fracture, and an orthorhombic crystal system . 20. A crystal system is described by three prism with a parallelogram as its base.
