Dims: 3.9" x 2.0" x 1.7"(9.9 x 5.1 x 4.3 cm)
Wt: 3.77 oz.(107.0 g.)
Czar Drift, Mine #29, Washington County, Missouri, U.S.A.
This specimen consists of a narrow slab of gray limestone that is covered with reddish, tabular Marcasite crystals with a diamond-shaped cross-section. Their form is excellent, and some show evidence of twinning. They reach a maximum size of approximately 0.3" (8 mm) square and have a metallic luster. A single scalenohedral calcite crystal extends out of the cluster at an angle; it measures 0.4" (1.0 cm), has a faint yellow color and vitreous luster, is transparent and clear, and like the Marcasites, shows no damage. These are some very unusual crystals from a locality that I have not heard of before.