Image:Rhyolite pmg ss 2006.jpg

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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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Date/TimeDimensionsUserComment
current19:56, 24 November 2006800×533 (347 KB)Siim (Siim Sepp, 2006 Volcanic rock rhyolite. Photomicrograph with crossed polars. The width of the view is approximately 0,3 mm. Porphyritic texture. Main phenocrysts are quartz and altered potassium feldspar. Groundmass is composed of quartz, p)
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