Beautiful yellow fluorescent Calcite crystals on iridescent Chalcopyrite matrix from Sweetwater Mine, Ellington, Reynolds Co., Missouri, USA. A striking specimen featuring fine yellow fluorescent Calcite crystals elegantly perched on a sparkling Chalcopyrite matrix. The lustrous Calcite displays excellent transparency and sharp terminations, catching the light with a warm golden hue. Under UV light, the calcite displays a vivid fluorescence red/pink colour, adding an extra layer of visual allure. The metallic Chalcopyrite base adds contrast and depth, enhancing the overall aesthetic balance of the piece. Collected from the renowned Sweetwater Mine in Ellington, Reynolds County, Missouri, this locality is celebrated for producing some of the most attractive Calcite–Chalcopyrite associations in the Tri-State district. A choice addition for collectors who appreciate both crystal quality and locality significance. And an excellent addition for Midwest mineral collectors or enthusiasts of fluorescent specimens.