The image is a vintage illustration, likely from a scientific or geological publication. It features a large, irregularly shaped dark rock with numerous small, reflective crystal formations embedded within it. The crystals appear to be square or rectangular in shape, catching the light and creating a speckled effect across the rock's surface. Below the rock illustration are three diagrams of a cube-shaped box. Each box contains a small, dark square, presumably representing a sample of the rock. The boxes are shown from three different angles, providing a view of the top, side, and front. The diagrams are likely intended to illustrate the size and shape of the rock sample. The illustration is done in a detailed, hand-drawn style, with shading and texture used to create a sense of depth and realism. The background is a pale yellow, and the page number '116' is visible in the upper right corner. A caption at the bottom reads 'March 1. 1865. Published by J. Sowerby, London.'