File:Spar (calcite crystals).jpg
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Summary
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Spear-shaped crystals of calcite called dogtooth spar frequently line small pockets in the limestone rock. These crystals are a prominent feature of other caves in the Black Hills, most notably, Jewel Cave of Jewel Cave National Monument. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 02:44, 4 February 2008 | | 3,264 × 2,448 (1.69 MB) | Chiefsfan364 (talk | contribs) |
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