[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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