Dims: 2.45x1.76x1.32" (6.21x4.47x3.36cm)
Wt: 3.46oz (98.0g)
Douglas Hill, Lyon County, Nevada, USA
At first glance, this specimen displays a greenish-black sparkly crust on a layer of turquoise-colored chrysocolla. A loupe reveals that the greenish-black crust is actually composed of deep green crystals of transparent brochantite on a layer of fine brochantite needles that are so dark as to appear black (they are clearly a dark green under a bright light). There is also a yellow-green mineral present which (other than color) looks just like the chrysocolla.