| 1. | The tetrahedron, cube, and octahedron all occur as crystals.
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| 2. | This convex polyhedron is topologically similar to the concave stellated octahedron.
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| 3. | The octahedron is a regular polyhedron, and a triangular antiprism.
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| 4. | The octahedron is also a " rectified tetrahedron ".
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| 5. | Rhenium oxide crystallizes with a octahedron defined by six oxygen centers.
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| 6. | A common alternative that requires less volume is the truncated octahedron.
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| 7. | Kitson observed that they were good crystals showing octahedron and dodecahedron.
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| 8. | The other two vertices join to them to make the octahedron.
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| 9. | A regular octahedron is the dual polyhedron of a cube.
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| 10. | The Merkaba religious symbol, for example, is a stellated octahedron.
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