What Type of Rock Is It? Igneous
What Minerals Make Up the Rock? quartz, feldspars; Sometimes contain: biotite, diopside, hornblende, zircon
What Does It Look Like? Usually light colored; light gray, tan, reddish, greenish, brown. Fine grained, but often contains scattered larger crystals. May contain small pockets that were gas bubbles. Sometimes shows flow lines or bands.
How Was It Formed? Rhyolite is a volcanic rock. It forms from the rapid cooling of a magma or lava that contains a lot of silica (quartz). The molten material often contains gas bubbles which freeze into the rock. Pumice is a kind of rhyolite that has really a lot of tiny gas bubbles in it.
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