EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Rhyolite mineral rock crystals, polarised light micrograph. This rock consists of a silica (silicon dioxide) matrix enriched with sodium and potassium oxides. It is an igneous rock, forming when molten volcanic lava solidifies. The texture of the rock can vary widely, depending upon the conditions under which it forms. This sample is from Eggental near Bolzano, South Tyrol, Italy. Magnification: x20 when printed at 10 centimetres across.
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