Travertine decorative stone 1 : 無料・フリー素材/写真
Travertine decorative stone 1 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | 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 is coarsely-crystalline to finely-crystalline textured and can be solid or vuggy (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 seen in travertine - these can be common at some localities.------------------------------------From Diemer et al. (2012) - Building Stone Walking Tour of Uptown Charlotte:Travertine is a form of limestone deposited rapidly by spring water with a high mineral content. It often has a fibrous or layered appearance such as those visible here, and it occurs in white, tan, and cream (here) colored varieties. In caves it can form stalactites and stalagmites. It is frequently used as a decorative building material. Take a close look at all of the voids and small layers visible in the cut stone and imagine the centuries and millennia of mineral-rich water flowing and bubbling across the surface, making this laminated rock.------------------------------------Provenance: unknown/undisclosed/unrecordedLocality: exterior planters/pavers/walls next to Bank of America Building (also known as the Wachovia Center), downtown Charlotte, North Carolina, USA |
| 撮影日 | 2012-11-03 14:43:27 |
| 撮影者 | James St. John |
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