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Phonolite mineral rock crystals, polarised light micrograph

Phonolite mineral rock crystals, polarised light micrograph

C039/0296

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Credit

EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY

Caption

Phonolite mineral rock crystals, polarised light micrograph. This rock consists of feldspar, nepheline, pyroxene and amphibile minerals. It is an igneous rock, formed when molten volcanic lava solidifies. It often contains larger mineral crystals held within the fine-grained matrix, forming what is known as a porphyritic texture. The name 'phonolite' refers to the ringing sound the rock makes when struck. This sample, 12-15 million years old, is from Hohenkraehen, Hegau, Baden, Germany. Magnification: x20 when printed at 10 centimetres across.

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