Isometric SystemRoger Weller, geology instructor
wellerr@cochise.edu
copyright 2008-R.Weller
wooden crystal model
trisoctahedron (hhl)
model #05-1
Each of the eight faces of the octahedron
are split into three new faces
(hence the tris).

Photo is copyright free for non-commercial educational
uses.
Just credit photo to R.Weller/Cochise College.