This is a Manganoan Calcite from, N’chwaning Mine lll, Kalahari Manganese Field, Northern Cape, South Africa
colours pop when illuminated with UV light (see video for reference)
Crystal Dimensions: 7cm (2.7”) x 3.5cm (1.3”)
Crystal Weight: 60 grams
Manganoan calcite or manganocalcite is a variety of calcite rich in manganese, which gives the mineral a pink color.
Its chemical formula is (Ca,Mn)CO 3.