Your ice is very beautiful! I don't know if this will help you, but perhaps you may want to experiment with some free ice materials. They may have helpful characteristics you can use. : )

In the Downloads section of Cloud Pictures, scroll down until you get to "Ice Material 2". Some Ice cubes in .obj are included, but the download also includes 11 ice materials.

There is a large preview of those ice mats here, but you have to register to see the thread.

Also, there are  26 Snow & Ice Materials at Dreams of Vue d`Esprit. (Only 6 are shown on the page). Go to Downloads, Materials,  Schnee + Eis.  : )

Hope this helps in some way!