This is a vintage illustration of a mineral specimen. The main focus is a roughly triangular, irregular chunk of rock with a textured surface. The rock is a reddish-brown color with a pattern of fine lines suggesting a granular or layered structure. Covering the surface of the rock are numerous small, dark, flower-like formations. These formations have a central black core surrounded by radiating yellow 'petals' or crystalline structures. They appear to be densely packed across the surface, creating a visually striking contrast with the reddish-brown rock. Below the main mineral specimen are several individual crystal formations. There are three larger, elongated crystals with a hexagonal shape, colored in a pale yellow. In between these larger crystals are three smaller, rectangular crystals, also in pale yellow. The illustration has a hand-drawn quality, with visible linework and watercolor-like coloring. The background is a pale cream color. At the top right corner, the number '156' is written. At the bottom, there is text that reads 'Feby. 1. 1813. Published by J. Sowerby, London.'