The image is a vintage scientific illustration of a mineral specimen, likely from a geological or mineralogy publication. It's rendered in a detailed, hand-drawn style with watercolor washes. **Top Portion:** A large, irregularly shaped rock formation is depicted. Within a cavity in the rock, a dense cluster of bright green, cubic crystals is visible. The rock itself is a mottled brown and tan color, with a rough, textured surface. The green crystals stand out sharply against the darker rock, creating a visually striking contrast. **Bottom Portion:** Below the rock formation are two small, precise line drawings of cubes. One cube is oriented with its faces parallel to the viewer, showing a square front. The other cube is rotated, revealing a diagonal perspective and demonstrating its three-dimensional form. These cubes likely represent the crystal structure of the green mineral. **Overall Style:** The illustration has a classic, scientific aesthetic. The attention to detail in the rendering of the rock texture and crystal shapes suggests a focus on accurate representation. The use of watercolor adds a subtle, artistic touch. The number '87' is visible in the upper right corner, likely indicating a page number or plate number within the publication. A line of text is present at the bottom, possibly indicating the publisher or source of the illustration.