68.8 Gram Optical Perfect Calcite Polished Rhombohedron. Ultimate refraction. Research companies or display.
Here is a Optical Calcite Polished Rhombohedron. It has beveled edges and has a edge corner bump as seen in photo 4. I have sold these to optic companies in the past for research and lens production. One can also display it as is. It's refraction is so strong it's quite amazing. There is the slightest hint of a internal veil which can be seen. I quick shot this indoors. Measure is 1 3/8 by 1 inches. The calcite material comes from Brazil.
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