Octahedron

Octahedron: a polyhedron composed of eight triangular faces, formed by two square-based pyramids joined at their bases. Typical examples of this polyhedral shape include Diamond, Fluorite, and Chromite.

(Photo: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0/Wikimedia Commons, License CC BY-SA 3.0)

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