Fluorite, Calcite, Sphalerite – Minerva No. 1 Mine, Illinois, USA

 This characteristic specimen from Illinois, USA, is a wonderful aggregate of bicolored fluorites with edge lengths of up to 2 cm.
 The violet-blue zones stand out against the yellow core of the crystals. Transparent and lustrous calcite crystals further adorn this colorful, highly sought-after display specimen from the famous Minerva #1 mine.