Dims: 4.5 x 2.9 x 2.7" (11.4 x 7.4 x 6.9 cm)
Wt: 1 lb., 3.2 oz. (544 g)
Mundo Nuevo, Ancash Department, Peru
At least 100 Quartz prisms rest on this hand specimen from Peru. These crystals range in length from 0.1 - 0.8" (0.3 - 2.0 cm) and are generally in good condition, though much breakage is visible. Those crystals that are intact have excellent hexagonal prismatic form, with well-defined edges and clean faces that possess the standard vitreous luster. Some of these crystals are nearly as thin as human hairs, and a few have a flat, almost tabular shape. Most of these flatter crystals are part of 4 Japan-Law twins that can be seen with some close examination. One of these twins is exposed and obvious (see the close-up image), but the other 3 are partly concealed by other crystals, and take a while to find. Two others existed at one time, but are now incomplete due to breakage. The Quartzes rest on a base rock that is made up of various sulfides, including pyrite, sphalerite and chalcopyrite, and more Quartz.