| The principal crystalline forms of oxalate of lime, when it occurs as a urinary deposit, are the octahedral and the dumb-bell. |
| The most common type of radar reflector is the so-called square octahedral reflector, i.e. a reflector with eight cavities. |
| In the low-calcium orthorhombic pyroxenes, M2 contains magnesium and iron, and the polyhedron takes on a more regular octahedral shape. |
| The outer portion of the garnets is altered to clinochlore, and small octahedral crystals of magnetite and martite occur in the schist. |
| In 1990 bright emerald-green, transparent, octahedral fluorite crystals were discovered in the Kettle mine by mine surveyor Michelle Scott. |
| Galena is also found as larger isolated octahedral crystals within the coarse calcite cement in breccias in the upper parts of the core. |
