#esperite

Esperite (yellow), willemite (green) and calcite (red) from Franklin, New Jersey shown under short wave ultraviolet and white light.  Non-fluorescent minerals on the rock include franklinite (black) and some minor zincite (tiny red crystals).    According to Wikipedia, “Esperite is a rare complex calcium lead zinc silicate (PbCa3Zn4(SiO4)4)…  [It] has a white, greasy appearance in daylight and is much prized for its brilliant yellow green fluorescence under shortwave ultraviolet light.“