Dims: 3.4" x 3.1" x 2.7" (8.6 x 7.9 x 6.9 cm)
Wt: 13.1 oz. (371 g)
level 240, Huanuni Mine, Oruro Department, Bolivia
There are 4 trigonal tabular Siderite crystals on this specimen, all of which appear to be in very good condition. The largest of these crystals has dimensions of 2.5 x 2.4 x 1.3" (6.4 x 6.1 x 3.3 cm)- it is the largest Siderite crystal that I have seen. The other crystals do not exceed 1" (2.5 cm) in any dimension. All have a rather rough appearance but only the largest crystal shows any obvious human-induced damage. Their form is good, with well-defined edges and striated but clean faces that possess a pearly luster. The crystals have a brown color that is much darker than most that I have seen in Siderite crystals; this color is so deep that the larger crystal shows only a dim translucence around its edges in strong sunlight! The smaller crystals show good translucence and even a few small patches of transarence. These crystals are all attached to a base rock that is made up mostly of pyrite. This pyrite takes the form of very tiny, intergrown octahedrons and shows the standard metallic luster, though its golden color is a bit darker than usual. However, the pyrite crystals seem to permeate a matrix of either calcite or more Siderite.