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Adular (moonstone) is a variety of the mineral orthoclas from the group of feldspars. Due to its composition - alternating layers of orthoclas and albite minerals - an optical phenomenon called "adularescence" (or Shiller) arises when light strikes, thanks to which Adular is so well known and highly valued.
Madagascar
Antanarivo
1,6x1,5x1,3 cm
3.2g