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Chrysoprase whose green coloring results from to the addition of Kerolite

Kerolite or Cerolite is a metamorphic nickel bearing phyllosilicate mineral variety of talc, can be seen as a mixture of serpentine and saponite as well. It has the formula: (Mg,Ni)3Si4O10(OH)2·H2O. It is often considered as a talc variety and it was discredited 1979.