This is a vintage botanical illustration of a mineral specimen, likely from a scientific or geological publication. The background is a pale yellow, providing a neutral canvas for the detailed depictions of the mineral. The illustration features three main depictions of the mineral, each presented in a slightly different view. The top depiction shows a large, clustered formation of the mineral, with a vibrant, deep blue color. The mineral appears to be composed of numerous small, tightly packed, fibrous or needle-like crystals, creating a fluffy, almost floral appearance. It is mounted on a clear, crystalline base, which is rendered with delicate shading to suggest transparency. The middle depiction shows a similar, but smaller, cluster of the mineral, also mounted on a clear crystalline base. The color is a mix of deep blue and green, with a more pronounced crystalline structure visible. The bottom left and right depictions show smaller, isolated clusters of the mineral, presented as if viewed from above. The colors are a mix of blue and green, with a more pronounced crystalline structure visible. The style of the illustration is highly detailed and precise, characteristic of botanical and scientific illustrations from the 19th or early 20th century. The artist has used delicate shading and line work to create a sense of depth and texture. The overall impression is one of scientific accuracy and artistic beauty.