I thought that this was already reported, but wasn't able to find apost, so here it is: the crystals in the Scintillating Caves and alt Old Forest are all displayed white (base gfx tile), regardless of their flavour - red, white, blue, black, etc. The issue started around the official move to 1.0.5 in the git version, iirc and is still present.
EDIT: Aha, found it (whew, I'm glad that I haven't imagined that one). It was in the 1.0.5 beta thread:
Noel wrote:Just started a Shalore Archer -- the Red Crystals in Scintillating Caves all seem to be white, both in the dungeon and in Inspect Creature.