Dims: 2.6 x 2.5 x 2.0" (6.7 x 6.3 x 5.0 cm)
Wt: 9.5 oz. (269 g)
Douglas Hill, Lyon County, Nevada, U.S.A.
A crust made up of 3 separate minerals rests on the copper-laden base of this cabinet piece. The Brochantite section of the crust is the only one that contains definable crystals; these are generally in very good condition, as they show a moderate amount of crushing damage. These monoclinic blades are tiny, not exceeding 0.1" (3 mm) in length, and tend to aggregate into small groups that are intergrown to form the crust. All have a deep green coloration and a bright, vitreous luster. They are likely transparent, though their very deep green color and small size make this difficult to determine. A portion of this crust appears to have pseudomorphed into a different mineral- it looks very much like malachite. The final portion of the crust is made up of turquoise that shows slight evidence of botryoidal form and the classic deep aqua-blue coloration. The base rock itself is made up of several other minerals, including sphalerite and possibly cuprite.