Join Date: Nov 2011
Location: Long Beach, Maryland
One thing to keep in mind, irreguardless of the rock type, is that sparkly rocks rarely stay that way in an aquarium, unless you plan on periodically scrubbing them.
I tried putting large quartz crystals in a tank once, clear and Amethyst and they lost their sheen pretty fast....still looked interesting but not the sparkly crystals that I had envisioned!!!