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37.4 MB (5.3 MB compressed)
4430 x 2953 pixels
37.6 x 24.9 cm ⏐ 14.8 x 9.8 in (300dpi)
MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Ancient Roman columns. This shows several types of rock used to make architectural columns. In the foreground is fine-grained The colours in this column indicate different minerals in the matrix: quartz is white, plagioclase feldspar is grey and mica is black. Behind it is a far coarser-grained mineral, with travertine and marble behind that.
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