File:Travertine stalactite (dripstone) 7.jpg
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| Description |
English: The general term for all secondary mineral deposits occurring in caves is speleothem (a.k.a. "cave formations"). Two to three hundred different minerals have been reported to occur in various types of speleothem around the world. The most common speleothem minerals are calcite (CaCO3), aragonite (CaCO3), and gypsum (CaSO4·2H2O). Calcareous speleothem is given the rock name "travertine".
Varieties of cave travertine are named based on morphology and origin. The most common variety is dripstone, which forms by dripping water. Other types of travertine include flowstone, knobstone (a.k.a. coralloids), helictites, shelfstone, rimstone, cave pearls, frostwork, etc. This is a cross-section through a travertine stalactite, which is a variety of dripstone. Dripstone forms by precipitation of minerals from dripping water. Dripstone structures attached to cave ceilings are called stalactites. Dripstone structures on cave floors are called stalagmites. Notice the small hole at the center - stalactites have open internal conduits (although they can get subsequently filled in). The cross-section shows that the stalactite is composed of a mix of coarse-grained, radiating crystals and fine-grained concentric layers. I strongly suspect this was found on a cave floor, already detached. One side shows significant dissolution, as if it was resting sideways. And, the broken cross-section is coated with a very thin layer of travertine Locality: unknown (specimen purchased from a rock shop in Okaton, South Dakota) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50700504593/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50700504593. It was reviewed on 11 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:09, 11 December 2020 | | 2,188 × 2,181 (2.72 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50700504593/ with UploadWizard |
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