Calcite. Multiform crystals (Harris Creek District - Illinois, USA, Photo: Reinhard Rauschegger; Fengjiashan Mine - Hubei, China; Calcite with Sphalerite, Elmwood Mine - Tennessee, USA; Pallaflat Mine - Cumbria, England; 2nd Soviestky Mine - Dalnegorsk, Russia; Near Regensburg - Germany, Photo: Karl Propstl; Calcite in Quartz, Cheng Zhun - Hunan Province, China; Gopfersgrun - Germany) [8v 4000 FCFA]