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A rock or pebble can be cut. If one does so, and one has the equipment and the patience, it is possible to make a thin section of that rock by glueing a slice to a piece of glass and grinding the rock until almost nothing is left: just a flimsy piece of 0,03 mm. This almost-nothing is called a thin section. Geologists use thin sections to determine how certain rocks are looking on the inside. Because of their thinness light can go through them, and in polarized light the crystals of which they are composed and their varied shapes are clearly visible. I photographed many of those transparent beauties. Some are here for you to see. |
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