George16

While researching tetragonal crystals I found that the styrofoam ball model we made is a octahedron, because it's edges are all the same length (4 balls), and it has eight faces. This is the website http://www.windows.ucar.edu/tour/link=/earth/geology/crystal_shapes2.html Shapes of Mineral Crystals

		Cubic crystals are not always cube shaped! There are many that are shaped like octahedrons (eight faces), and some that are shaped like dodecahedrons (12 faces).
		Tetragonal crystals are shaped like cubic crystals but are longer in one direction making shapes like double pyramids and prisms.