Isometric System-Wood Model
Cochise College    
Crystals and Crystal Models
Geology Home Page                      

Roger Weller, geology instructor
copyright 2017-R.Weller

trisoctahedron  (hhl)
model #05-3
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.