Dims: 3.44x2.39x1.37" (8.74x6.06x3.48cm)
Wt: 4.93oz (139.5g)
Hildaco County, New Mexico, USA
This specimen appears to be a rather plain chalky-white rock with a black crust at one end (which has hundreds of tiny cerussite crystals). Under short-wave ultraviolet light, the plain white "chalk" glows a bright blue-white, showing that this is hydrozincite. There are other minerals present, and the hydrozincite is rather impure, resulting in differences in brightness. The fluorescent image is too blue - the visual appearance is nearly white.