41. It forms metallic grey orthorhombic crystals. 42. It crystallizes in the orthorhombic system. 43. Mesolite crystallizes in the orthorhombic system and typically forms fibrous, acicular prismatic crystals or masses. 44. It forms black orthorhombic crystals which often appear to be cubic in form due to cleavage. 45. The material exists as the sulfosalt mineral antimonselite, which crystallizes in an orthorhombic space group. 46. More complicated aggregations have also been observed, such as rhombohedral, tetragonal and orthorhombic phases. 47. Two polymorphs are known, one orthorhombic ( shown in the infobox ) and one monoclinic. 48. Anhydrous potassium picrate forms orthorhombic crystals. 49. Macdonaldite crystallises in the orthorhombic system. 50. Grandreefite was originally classified as an orthorhombic mineral but was determined monoclinic instead upon further analysis.
