Rhyolite lava is too stiff and viscous to grow crystals except for isolated phenocrysts. Granite, the equivalent of its extrusive (volcanic) rock type rhyolite, is a very common type of intrusive igneous rock. 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. Source(s): I know because I took Mineralogy and Petrology classes. Rocks like that crop out in the Baltic Sea. Intrusive and Extrusive Rock Classification Basalt, andesite, and rhyolite. Intrusive Igneous Rock , it is because gabbro has a very rough texture.Intrusive cools slowly and extrusive cools rapidly. Rhyolite. Examples of extrusive rocks include basalt, rhyolite, obsidian, scoria, and pumice. d. gabbro and basalt. However, the difference is that rhyolite formed intrusively and granite formed extrusively. The Extrusive group of igneous rocks, or volcanic rocks, are formed as the magma exits the volcano and cools on the surface or very near the surface of the earth. Punjab4. The magma that erupts from the volcano, now called lava, will cool and solidify quickly in the contrasting temperature at the surface of our planet. volcanic. a. basalt. Permalink. Igneous Rock--Intrusive and Extrusive; Rhyolite (Extrusive) Rhyolite (Extrusive) Posted 5 years ago. Like other extrusive rocks such as basalt, rhyolite has an aphanitic texture; meaning that the mineral crystals that make up the rock are too small to distinguish with the naked eye. They were brought to Saaremaa by the advancing glacier during the ice age. Rhyolite is a high-silica volcanic rock that is chemically the same as granite but is extrusive rather than plutonic. Basalt is a common extrusive rock. Typically, the melting is caused by one or more of the following processes -- an … Rhyolite is white to gray in color and is a very common rock. Width of sample 9 cm. Width of sample 7 cm. Igneous rocks are formed when molten rock cools and solidifies, with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. usually light colored. e. It contains more than 68% weight % of silica in composition and is granular and coarse-grained in texture. It is erupted out of volcanoes. While granite has crystals that are generally easy to see, in rhyolite the crystals are often too small to see. In rapidly cooling magma, the resulting grains and crystals that form the rock are tiny in contrast to the larger grains and crystals found in rocks that cooled much slower deep in the crust. 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