Natural crystals of diamond, alum or fluorite are commonly octahedral.
8 faces, 12 edges, 6 vertices
A shape that has 8 triangular faces is a octahedron.If you want to see a picture of a octrahedron here is a website.http://en.wikipedia.org/wiki/File:Octahedron.svgI had this as a maths question it was hard.
1~Tetrahedron *4 faces (made of equilateral triangles) *6 edges *5 vertices 2~Hexahedron (cube) *6 faces (made of squares) *12 edges *8 vertices 3~Octrahedron *8 faces (made up of equilateral triangles) *12 edges *6 vertices 4~Icosahedron *20 faces (made of equilateral triangles) *30 edges *12 verticies 5~Dodecahedron *12 faces (made of pentagons) *30 edges *20 vertices.