File:Rhyolite pmg ss 2006.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:56, 24 November 2006		800 × 533 (347 KB)	commons>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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