Tennantite-Tetrahedrite (Series) coated by Chalcopyrite and with Siderite and Calcite

Clausthal-Zellerfeld, Goslar District, Harz, Lower Saxony/Niedersachsen  Germany

Specimen size: 4 × 3.2 × 1.7 cm = 1.57” × 1.26” × 0.67”
Main crystal size: 0.9 × 0.8 cm = 0.35” × 0.31”