Rhyolite
Rhyolite is an igneous, volcanic rock, o felsic (silica-rich) composeetion (teepically > 69% SiO2—see the TAS classification).
It mey hae ony texture frae glassy tae aphanitic tae porphyritic. The mineral assemblage is uisually quartz, alkali feldspar an plagioclase (in a ratio > 1:2—see the QAPF diagram). Biotite an hornblende are common accessory minerals.
| Igneous rock | |
 | |
| Composeetion | |
|---|---|
| Felsic: igneous quartz an alkali feldspar (orthoclase, sanidine an sodic plagioclase), biotite an hornblende. |
This article uses material from the Wikipedia Scots article Rhyolite, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available unner CC BY-SA 4.0 unless itherwise notit. Images, videos and audio are available under their respective licenses.
®Wikipedia is a registered trademark of the Wiki Foundation, Inc. Wiki Scots (DUHOCTRUNGQUOC.VN) is an independent company and has no affiliation with Wiki Foundation.