“"From Zerfass collection" Gemmy purple cubic Fluorite crystals around a dark metallic Sphalerite mass on a white Calcite carpet. Shallow depth of field extended by merging two images of the specimen. Specimen size 10x9x4 cm, once in Paul Zerfass collection. Bought at Genova Mineral Fair, 2019. Photo and collection Alessandro Cantamessa (#2074). ”