This criterion includes the overall appearance or the beauty of the specimen. Aesthetic appreciation will vary from eye to eye, but some basic parameters are universal: crystal isolation or well-defined individual crystals; crystallized matrix; contrasting colors and textures; crystals of differing size and height; three-dimensional viewing angles; and specimens, which (to quote our friend and master collector, Steve Smale) have “good horizons” or in other words, interesting and well-developed top edges where your eye is initially drawn. Just like any work of art, it must have a pleasing aesthetic arrangement to your eye. This is simply a visual reference to the appeal of the mineral as one would look at any three-dimensional sculpture. The intrinsic value of aesthetic minerals is the pleasure you get from viewing them.