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Image: Benstonite-Calcite-Fluorite-154901

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Description: Benstonite, Calcite, Fluorite Locality: Mahoning No. 1 Mine (Minerva No. 1 Mine), Ozark-Mahoning Group, Cave-in-Rock Sub-District, Illinois - Kentucky Fluorspar District, Hardin County, Illinois, USA (Locality at mindat.org) Size: 15.4 x 12.2 x 11.9 cm. This is an OLD, unusual, very large specimen from Hardin County that is very uncommon to see on the market. What you have is these large, very spiky calcite scalenohedra (some of them do have tip cleaves), with a coating of whitish benstonite. The calcites have grown on a layer of teal-colored fluorite. Two layers of this fluorite sandwich a layer of brownish-yellow calcite. An old-timer! Ex. collection of Gary Hansen, noted Mid-west dealer until 1980s.
Title: Benstonite-Calcite-Fluorite-154901
Credit: http://www.mindat.org/photo-154901.html
Author: Robert M. Lavinsky
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: https://creativecommons.org/licenses/by-sa/3.0
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