1. 
   illite
   any of a group of mica-type clay minerals widely distributed in marine shales and related sediments. Illite contains more water and less potassium ... [2 related articles]
   Found op http://www.britannica.com/eb/a-z/i/9
   
   
2. 
   Illite
   Illite is a non-expanding, clay-sized, micaceous mineral. Illite is a phyllosilicate or layered alumino-silicate. Its structure is constituted by the repetition of tetrahedron – octahedron – tetrahedron (TOT) layers. The interlayer space is mainly occupied by poorly hydrated potassium cations r...
   Found op http://en.wikipedia.org/wiki/Illite
   
   

Tip: double click on a word to show its meaning.