Calcite with Chalcopyrite from Brushy Creek mine

Beautiful Biterminated Calcite with Chalcopyrite from Brushy Creek mine, Missouri, USA
 
 Bi crystal finished. Sublime presentation, on a beautiful iridescent Chalcopyrite , this Calcite deserves its place in a beautiful collection or showcase !
 
 Size: 12.5cm by 12.5cm by 4.5cm for 970gr
 Chemical formula: CaCO3
 Crystal system: Trigonal
 Hardness Mohs scale: 3
 
 Definition :
 Calcite is amineral composed of natural calcium carbonate.