There are several different types of agates are found around Kerrouche (or Kerrouchen). One comes in the form of vein agates lined with brown plumes and the agates are generally orange to yellow sometimes with bright red colors. The agates with white to gray colors are widely encountered, and some comes with excellent shadowing effects.   The low-quality white agates were chemically treated to produce the strong black and white colored agates marketed as "Tuxedo Agate". The third type of nodules are found often with plume-like inclusions hanging from the walls/ceilings.