However, it's important to note that:

* Octahedrons are not the only shape it can take: Magnetite can also form in cubes, dodecahedrons, and other shapes.

* Crystals are often imperfect: In nature, crystals rarely form perfect shapes. Magnetite crystals can be distorted, twinned, or have irregular faces.

Here's a breakdown:

* Octahedron: A shape with eight triangular faces meeting at six points. It's the most common crystal shape for magnetite.

* Cube: A shape with six square faces.

* Dodecahedron: A shape with twelve pentagonal faces.

So, while octahedral is a common crystal shape for magnetite, it's not the only one.