Dims: 4.5" x 2.8" x 1.5" (11.4 x 7.1 x 3.8 cm)
Wt: 11.8 oz. (335 g)
Ace of Diamonds Mine, Herkimer County, New York, U.S.A.
This beautiful hand specimen consits of 5 "Herkimer Diamonds" that are intergrown. These crystals range in size from 0.7 x 0.6 x 0.4" (1.8 x 1.5 x 1.0 cm) to 2.5 x 2.1 x 1.7" (6.4 x 5.3 x 4.3 cm) and are in generally good condition, though one of the larger crystals shows considerable conchoidal fracture damage. All show the short, stubby hexagonal prismatic form and double-terminating that is common for crystals from this locality. Their edges are straight and well-defined and their faces are clean and smooth, showing a bright, vitreous luster. All are transparent and clear, though most are considerably internally-fractured and contain many dark inclusions. The damaged crystal has a very unusual, triangular internal fracture just under the surface of one of its termination faces (see the close-up image)- I have not seen such an internal flaw as this before. Most of the crystals were separated from each other when they were mined; they were subsequently glued back together. However, this is not easily noticeable. There is only a very small amount of a rust-colored host rock present.