GEOLOGY amp; MINERAL RESOURCES OF SRILANKA
#0183;#32;Mica: Mica is a group of minerals of the hydrated alumino silicate of iron (Fe), magnesium (Mg), potassium (K), sodium (Na) etc. Mica could be easily identied by its unique aky structure. The most common types of mica in Sri Lanka are phlogopite (Mg rich mica) and biotite (Fe rich mica).