Manganocalcite, Huaron Mine, Peru


This is a unique mixed-mineral specimen, that due to its manganocalcite content, is of interest as a fluorescent specimen.  It consists of white to light pink nodular growths of small intergrown scalenohedral crystals of manganocalcite on a bed of pyrite and large tetrahedrite crystals, with small clusters of quartz crystals.  It is from the Huaron mine, Pasco department, Peru.  The manganocalcite shows an orange/red fluorescent response under all UV wavelengths, brighest under mid wave.  This specimen measures 8.1 x 6.5 x 3.0 cm, and weighs 206 grams.  Manganocalcite is a variety of calcite in which manganese replaces some of the calcium in the crystal structure, and imparts the property of beautiful orange to pink fluorescence under UV.


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