The image shows the inclusions, about 14 nm thick, of the nickel layer silicate which causes the color in chrysoprase from the Gumigil Mine, Marlborough, Queensland.  Image provided by Paulo Vasconcelos, University of Queensland. (Vasconcelos P, Singh B (1996) The crystal chemistry and genesis of chrysoprase. Mesozoic geology of the eastern Australia Plate conference, Abstracts - Geological Society of Australia, 43, p. 545, 1996.)