Twinned Calcite with Calcite, Palygorskite and manganese oxides

Palmarejo Mine, Palmarejo, Municipio Chinipas, Chihuahua  Mexico (10/2016)

Specimen size: 18.3 × 10.7 × 10 cm = 7.20” × 4.21” × 3.94”
Main crystal size: 6.5 × 4.8 cm = 2.56” × 1.89”