This vivianite is from the Huannuni Mine in Huanuni, Dalence Province, Oruro Region, Bolivia. This area is the largest cassiterite deposit known. It also contains 61 different mineral species including the phosphate vivianite. It contains the elements A, X, O, and H. This vee-shaped piece consists of two fan-like clusters of elongated vivianite crystals. The clusters have interpenetrating terminations. They have a charcoal color with a slight green hue (when strongly lighted) and the pearly luster varies depending on the orientation towards light. The cluster on the right (photo 1) is 2 3/8 inches or 60 mm tip to tip and the cluster on the left 1 7/16 inches or 37 mm tip to tip. The piece is 3/8 inches or 9 mm at it’s widest point.