gold ore mpa ucs

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Rhyolite; Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz ( 20%) and alkali feldspar ( 35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses. Many rhyolites consist mainly of glass, and are termed obsidian, or are partially devitrified ...

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