To see more amethyst crystals, click here.
an interactive QTVR crystal of amethyst. Click here to view an interactive 3D model of the amethyst structure (this will open a new browser window).
Here I zoomed in even further and clearly saw the hexagonal prism.Technorati Tags: amethyst crystal, hexagonal prism, trigonal, tetrahedron
If only we had the time to teach polyhedra to our students in the field while we collect rocks. I know they would never forget the experience or the mathematics.Gemstar Gemstones Set