Calcite with Chalcopyrite from Brushy Creek mine

Beautiful Calcite with Chalcopyrite from Brushy Creek mine, Missouri, USA
 
 Sublime presentation, on a beautiful iridescent Chalcopyrite , this Calcite deserves its place in a beautiful collection or showcase !
 
 Size: N / C
 Chemical formula: CaCO3
 Crystal system: Trigonal
 Hardness Mohs scale: 3
 
 Definition :
 Calcite is amineral composed of natural calcium carbonate.