File:"Tanzanite" (travertine).jpg
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Summary
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| Description |
English: Travertine is a calcareous, chemical sedimentary rock. It is composed of calcite (CaCO3 - calcium carbonate). Travertine forms at the surface at cold springs and many hot springs. It also forms in subsurface dissolutional voids (caves) in the form of speleothem - dripstone, flowstone, etc. Familiar examples of dripstone include stalactites and stalagmites.
Travertine has a coarsely-crystalline to finely-crystalline texture and can be vuggy or solid (as in the example seen here). In many samples used as decorative stones, well-laminated travertine alternates with disordered, chaotic travertine. Fibrous, upward-radiating "bushes" are sometimes present - these can be common at some localities. This decorative stone sample is a cut and polished travertine with irregularly concentric layering. Its trade name is supposedly "Tanzanite" (not to be confused with the bluish to purplish gemstone from eastern Africa) - I'm not sure the trade name is correct, however. Provenance: unknown/undisclosed/unrecorded [If anyone knows the locality and/or geology for "Tanzanite" travertine in the decorative stone trade, please leave a comment.] |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53285728448/ |
| 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@N05/53285728448. It was reviewed on 31 October 2023 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 | |
|---|---|---|---|---|---|
| current | 20:22, 31 October 2023 | | 5,760 × 3,608 (20.91 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53285728448/ with UploadWizard |
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