21. It is a dark grey metallic mineral which forms acicular prismatic monoclinic crystals. 22. It is monoclinic with a body centered lattice similar to those of anorthite. 23. Anhydrous is a monoclinic crystal with slightly sulfuric odor. 24. Phenyllithium is an organolithium compound that forms monoclinic crystals. 25. Pumpellyite crystallizes in the monoclinic -prismatic crystal system. 26. It is a soft, dark grey telluride mineral which forms monoclinic crystals. 27. It crystallizes in the monoclinic -prismatic crystal system. 28. It crystallizes as monoclinic prisms which occur as apple green acicular radiating clusters. 29. It is a soft yellowish white mineral which crystallizes in the monoclinic system. 30. Crystals are tetragonal, though commonly deformed to the extent of appearing monoclinic .
