Antigorite varieties

 

  
Antigorite is a member of the Serpentine Group of minerals that also includes Chrysotile and Lizardite. There are a couple of gem varieties of Antigorite; Bowenite and Williamsite. Bowenite is a translucent, light green to dark green, rarely blue-green, variety. Williamsite is a very translucent, medium to deep, apple green variety of Antigorite that gets its color from the presence of chromium (Cr). It often has inclusions of black microcrystals of Chromite in it.