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S A N D S T O N E
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| Photo Information |
Copyright: Serghei Pakhomoff (serp2000)
![Silver Star Critiquer/Silver Note Writer [C: 38 W: 0 N: 22]](http://i1.treknature.com/misc/s-n-s.gif) (396) |
| Genre: Landscapes |
| Medium: Color |
| Date Taken: 2008-11-23 |
| Categories: Mountain |
| Exposure: f/3.5, 1/30 seconds |
| More Photo Info: [view] |
| Photo Version: Original Version |
| Date Submitted: 2009-05-13 1:55 |
| Viewed: 463 |
| Points: 6 |
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| [Note Guidelines] Photographer's Note |
Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains. Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any color, but the most common colors are tan, brown, yellow, red, gray and white. Since sandstone beds often form highly visible cliffs and other topographic features, certain colors of sandstone have been strongly identified with certain regions.
Some sandstones are resistant to weathering, yet are easy to work. This makes sandstone a common building and paving material. However, some that have been used in the past, such as the Collyhurst sandstone used in the north of England, have been found less resistant, necessitating repair and replacement in older buildings.[1] Because of the hardness of the individual grains, uniformity of grain size and friability of their structure, some types of sandstone are excellent materials from which to make grindstones, for sharpening blades and other implements. Non-friable sandstone can be used to make grindstones for grinding grain, e.g., gritstone.
Rock formations that are primarily sandstone usually allow percolation of water and are porous enough to store large quantities, making them valuable aquifers. Fine-grained aquifers, such as sandstones, are more apt to filter out pollutants from the surface than are rocks with cracks and crevices, such as limestone or other rocks fractured by seismic activity. |
nagraj, matatur, mlines has marked this note useful
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- nagraj
![Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 566 W: 94 N: 1194]](http://i1.treknature.com/misc/g-g-g.gif)
(4870) - [2009-05-13 7:35]
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HI,
Very beautiful abstract of nature, fine colors and design. Contrast could be increased to make this better. tfs.
nagraj.v
An almost abstract capture of fine, iron-sandstone strata under very effective illumination Serghei, TFS this excellent example of non-living nature!
Mehmet
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- mlines
![Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 541 W: 24 N: 596]](http://i1.treknature.com/misc/g-s-g.gif)
(2870) - [2009-05-29 16:51]
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Hi Serghei, Very vibrant colours well capture and presented. Interesting subject and notes. What i find most appealing is the swirls and colours. TFS. Murray.
