File:Cave travertine ("Kokoweef Cave Onyx") (late Cenozoic; cave hosted in Paleozoic marine limestone; cave at Kokoweef Peak, Ivanpah Mountains, Mojave Desert, northeastern San Bernardino County, southeastern California, USA) (15518044498).jpg

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Cave travertine (slice, 5.7 cm across at its widest) from the late Cenozoic of California, USA.

This is a slice through a mass of what appears to be a composite stalactite, which is a type of dripstone. Dripstone is one of numerous varieties of speleothem, which refers to all secondary mineral deposits in caves. Speleothem (= "cave formations") is most commonly composed of calcite (CaCO3). Calcareous speleothem is referred to using the rock term "travertine". Travertine most commonly occurs in caves, but also occurs around many cold springs and some hot springs.

This material comes from a cave in Kokoweef Peak in southeastern California, where several mines occur. Cave travertine from this locality is called "Kokoweef Cave Onyx" in the retail market. "Onyx" is a horrid term and has no fixed definition. In this case, onyx is merely cave travertine.

Age & geologic context: late Cenozoic; cave hosted in Paleozoic marine limestone

Locality: cave at Kokoweef Peak (possibly Crystal Cave or Kokoweef Cave), Ivanpah Mountains, southeast of the town of Mountain Pass, Mojave Desert, northeastern San Bernardino County, southeastern California, USA (Kokoweef Peak is located at 35° 25' 12.37" North, 115° 29' 37.71" West)
Date
Source Cave travertine ("Kokoweef Cave Onyx") (late Cenozoic; cave hosted in Paleozoic marine limestone; cave at Kokoweef Peak, Ivanpah Mountains, Mojave Desert, northeastern San Bernardino County, southeastern California, USA)
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15518044498 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current03:19, 6 December 2019Thumbnail for version as of 03:19, 6 December 20192,820 × 2,286 (2.28 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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