Crystal Roaches

Curse these Roaches to the moon and back!
I've been trying to track down their nest for weeks-as the geological sub-committee breathes down my neck, at that! I get that the Roaches are a threat to the collection, but I can't do my job if I'm not allowed to isolate their food source!
I had to sneak in one night after the Committee chair had gone home to even take a look-Guess what? They made it in anyway. And Geodes are their favorite food. 
I'm going to have my work cut out for me to even salvage a portion of the collection. 

-Adventurer's Guild Maintenance Log, 1922

Basic Information

Anatomy

Crystal Roaches are similar to many other Roach species in the Mortal Lands-hard to kill, persistent, and swarm around available food sources. What separates them from their more organic cousins, however, is their diet; minerals. The particular mineral they consume results in the particular sheen their carapace takes; Quartz will result in smoky white, diamonds are disturbingly crystal-clear, and purple geodes will result in a purple sparkle.
While clusters of Crystal Roaches tend to prefer a particular mineral, the carapace will change over time if the diet changes, resulting in a iridescent mix of colors.

Dietary Needs and Habits

Crystal Roaches subsist on minerals- the richer, the better. Geodes, in particular, are a favorite of theirs. Considering the plethora of minerals available in the wild, it is a miracle that the Roaches have not eaten the Mortal Land to a barren crust. Experts have noted that Crystal Roaches will prefer minerals with more shine and luster as mating season approaches.
Rock, despite the presence of mineral content, is not part of a Crystal Roach's diet. This may because there is not enough of the mineral to easily extract from the rest of the rock, or even the structure of the mineral does not make itself tenable for consumption; Crystal Roaches have only been observed consuming minerals in their natural, geometric forms. 
Crystal Roaches have been known to swarm around available sources of minerals, and are frequently found around mining sites as new minerals are unearthed.

Lifespan

3 Years