Did a quick render using my method for volumetrics, this time using image maps as my dream lead me too. I tried to blur the volume density map for the glass shader, which did make a interesting effect, but it being blurred makes it hard to see the actual rock texture overlay. Additionally, the shadow map being set to UV seems to do some interesting effect hahaha. Also some opacity holes in the model. I tried to lower it as much as possible for shadows but wasn't high enough to patch holes.
Added an example of the surface shaders on a orb. Lowered it's volume density. Looks better.
Surface shaders, textures, and example orb TGO available for download: https://planetside.co.uk/forums/index.php/topic,25389.msg253210.html#msg253210
cool experiment man...keep on dreaming!