Pilt:Rhyolite pmg ss 2006.jpg

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See on jagatud fail ja asub Wikimedia Commonsis. Faili sealne kirjeldus on toodud allpool.

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[edit] Lühikirjeldus

Siim Sepp, 2006

Volcanic rock rhyolite. Photomicrograph with crossed polars. The width of the view is approximately 0,3 cm. Porphyritic texture. Main phenocrysts are quartz and potassium feldspar. Groundmass is composed of quartz, potassium feldspar, volcanic glass (partly crystallized to spherulitic aggregates), iron hydroxides and chlorite. Contains vesicles with quartz growing on their walls forming miarolic structure.

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I, the author of this work, hereby publish it under the following license:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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