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Sandstone


Sandstone
Photo Information
Copyright: Ioannis Logiotatidis (logios) Silver Star Critiquer/Gold Note Writer [C: 18 W: 3 N: 76] (276)
Genre: Landscapes
Medium: Color
Date Taken: 2005-05-14
Camera: Nikon D70, Nikon 18-70mm, HOYA 67.0 mm SCYLIGHT 1B
Exposure: f/7.1, 1/200 seconds
Photo Version: Original Version
Theme(s): Sandstone Petra, Jordan, My favorites [view contributor(s)]
Date Submitted: 2005-11-07 9:04
Viewed: 23458
Favorites: 1 [view]
Points: 18
[Note Guidelines] Photographer's Note
Petra is one of the world's most beautiful architectural sites carved from some of the oldest exposed sandstone on Earth (Cambrian and Ordovician sanstone that is 450-550 million years old). However, the sandstone in Petra is typical in that it is comprised of colorless quartz clasts (the particles in sandstone) attached by a matrix binding that is composed of silica (Si), calcium (Ca), iron (Fe), aluminum (Al), manganese (Mn) and minor amounts of others (sodium (Na), lithium (Li), etc.). So the colors are only a function of colorants present in the matrix: browns from iron, yellows from Na and Fe, pinks from Na and Li, etc.

These minor matrix elements (ie. Ca, Mg, Mn, Fe, etc.) have mobilized and separated into what is commonly called 'Liesegang Banding' (banding in color and composition of ores caused by diffusion). However, the banding has been erroneously (and commonly) attributed to its deposition, but in fact when examined (and often simply observed) the original bedding (from coastal fluvial and dunal deposition) is unrelated to these spectacular colors that are not to be seen in the same way anywhere else on Earth.

In fact the colors are covered by a sort of 'drapery' given by recent and secondary deposition of simple calcium carbonates that are relased from the matrix and then redeposited atop and below the sandstone. This drapery is not very durable and is easily broken-off or eroded.
Source http://www.pa-chouvy.org/Photos/Jordanie/JordaniePetraRoches.htm.
You can see the theme of Jordan.

extramundi, marhowie, thistle, Robbrown, Janice, lovenature, bobair has marked this note useful
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Critiques [Translate]

Hi Ioannis.
Very descriptive & informative shot, beautifully composed and framed. I would love to go to Petra sometime, so thank to bring to me a little piece enclosed in this image. Thanks for sharing. Felipe.

This has to be some of the most colorful sandstone I've ever seen Ioannis. You have captured these wonderful colors, textures and ridge banding very well. Excellent! Thank You.

Superb post!
The photo is very beautiful and the whole post really interesting.
I like it very much.
VERY WELL DONE & TFS

Hi Ioannis lovely capture the colours are great for me the only down side is a lack of scence of scale it coould be a vast area or almost a micro peble?
The note is superbly informative TFS yours Robert

Hi Ioannis

Brilliant shot. You have composed this extremely well. Nice colours and use of light. Sharpness and detail are spot on. Well done. Thanks.

  • Great 
  • Janice Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3277 W: 148 N: 6163] (18832)
  • [2005-11-08 5:02]

Ioannis you show us such an amazing colour variation in this sandstone. I never knew it could be this colour. Thank you for sharing and also for the very interesting notes too.

Wonderful picture you have got here, with rocks that look like semiprecious stones.

  •      
  • carnota Gold Star Critiquer [C: 51 W: 0 N: 0] (0)
  • [2006-01-16 8:26]

I like your photographies, but this specially, has great interest, harmony chromatic and a perfect one and balanced composition.

Great shot and uselful information.....

great, visited there just a month ago, TFS Ori

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