3" Sharp, Lustrous Arsenopyrite Crystals - Portugal

This is an incredibly lustrous, 3" wide cluster of sharp arsenopyrite crystals that formed in association with golden siderite. It was collected from the Panasqueira Mines of Castelo Branco. This industrial mining center extends over 12.5 square miles and contains many mining sites, producing a wide variety of exceptional mineral specimens.

This specimen is accompanied by an acrylic display base and mineral tack.

Arsenopyrite is an iron arsenic sulfide with the chemical formula FeAsS. Depending on minerals present during formation, the iron can be replaced by cobalt (Cobaltite). Arsenopyrite is the most common mineral containing arsenic and can be found in igneous, metamorphic and sedimentary rock. Crystals can be found as prismatic, twinned, columnar, elongated and massive formations within veins and are found in locations all around the world.

Arsenopyrite contains a significant amount of poisonous arsenic, making it somewhat toxic. Therefore, washing hands following handling of arsenopyrite specimens, is recommended.

Siderite & Arsenopyrite
Panasqueira Mines, Covilh√£, Castelo Branco, Portugal
3 x 2.5"