This is a cabochon made of Verde d'Arno (or Lineate d'Arno) which is a rare variety of "pietra paesina" or "ruin marble" existing the the Arno Valley near Florence in Tuscany, Italy. Verde d'Arno has a specific geometric pattern which reminds the cubist paintings of Paul Klee It is characterized by the intersection of various green triangular-shaped patterns and by the presence of brown to yellow shades, all due to iron oxides coloring this marly calcite. http://www.mindat.org/photo-768886.html http://www.mindat.org/photo-768887.html
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