| Copper, Cu, has been found associated with cuprite octahedra at Pedra Preta, where these minerals occur on talc and magnesite. |
| This Eagle mine is well known for dark spruce-green, rough-surfaced octahedra of fluorite associated with rhombohedra of rhodochrosite to 0.75 inch on edge. |
| One small lot of specimens from Alta Floresta, Mato Grosso, exhibited moderately rounded, well-developed octahedra. |
| Peterson and Jordan go on to investigate interesting links between integer octahedra and integer antiprisms. |
| The fluorite tends to occur only as cubes modified by the dodecahedron, with simple cubes or octahedra uncommon or absent. |
| Most that I have seen have been elongated octahedra or other forms, such as some of the branches of an arborescent aggregate. |
