Mica RoughMica comes in a variety of colours and has been used to create pearlescent or glittering paint pigments. It is a type of phyllosilicate, exhibiting a two dimensional sheet or layer structure. Among the principal rock forming minerals, micas are found in all three major rock varietiesigneous, sedimentary, and metamorphic. It helps us recognise flaws without self condemnation, so we are able to effectively address negative personality traits.