Best displays in a SW / LW combination - the blue Sphalerite looks great with the green Willemite.Location: Sterling Mine in Ogdensburg, NJ. A decent sized rock at: 5.5 inches x 3 inches x 2 inches and weights 3 lbs. 4 oz.Abbreviations: SW: shortwave, LW: longwave, NF: Non Fluorescent.As is the case with all fluorescent mineral specimens, a good quality UV lamp of adequate output and appropriate wavelength(short wave vs. long wave) is required to see the fluorescent res...ponse depicted in the photographs. An ordinary "black light" will not work for these minerals. Pictures taken with a Canon t3i and SuperBright 3 short wave UV lamp SW. LW is the Convoy 2.Shipping to US only, Payment by PayPal required. Will combine shipping whenever possible.