This article refers about a member of the mica group, and should not be confused with "margarita ".
Margarite is a calcium rich member of the mica group of the phyllosilicates Al )2. It forms white to pinkish or yellowish gray masses or thin laminae. It crystallizes in the monoclinic. It typically has a specific gravity of around 3 and a Mohs hardness of 4. It is translucent with perfect 010 cleavage and exhibits crystal twinning.
It occurs commonly as an alteration product of corundum , andalusite and other aluminous minerals. It has been reported as forming alteration pseudomorphs along with muscovite. The margarite in this occurrence forms preferentially along the dark graphite rich inclusions with the chiastolite crystals.