Dims: 6.0" x 4.5" x 4.5" (15.2 x 11.4 x 11.4 cm)
Wt: 3 lbs., 0.7 oz. (1.381 kg)
Amax Mine, Reynolds County, Missouri, U.S.A.
This rather complex specimen consists of nearly twenty small scalenohedral "dogtooth" Calcite crystals on a rather unusual host rock. The crystals range from 0.2 - 0.8" (0.5 - 2.0 cm) in length, with the largest ones occurring in the form of base-to-base contact twins. All have excellent crystal form, and the specimen as a whole shows almost no damage. These crystals have a pale yellow coloration and a vitreous luster, and are transparent and quite clear, though the twinning plane in the twinned crystals tends to be foggy. These crystals rest on a very strangely-shaped dolomitic limestone host rock; it almost reminds me of a coral that one would find in the ocean. It is covered with very small (2 mm diameter, maximum) white dolomite rhombohedrons that are rather heavily dusted with tiny spearhead marcasite and tetrahedral chalcopyrite crystals, which do not exceed 4 mm in diameter or length. I really like specimens like this one; it has many crevices and a lot of material to examine.