Description: An example of one of the Marcasite-Arsenopyrite from Panasqueira. Description: Huge epitaxial crystals of Arsenopyrite and Marcasite. They have grown together and you cannot tell where one starts and the other ends. In this case the crystal form is that of Marcasite but color and luster is that of Arsenopyrite. Specimen size: 6.5 × 7 cm = 2.6” × 2.8” Photo and specimen: http://www.fabreminerals.com/specimens/RSPOR-portugal-notable-specimens.php#T81ZB1

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