Igneous rocks include pumice, obsidian and basalt. The differences in these rocks come from what was happening when they cooled — obsidian is from a fast-cooling, finely grained lava, for example — and from the composition of the specific lava forming the rock. The Digital Atlas of Idaho notes lava containing feldspar and augite forms gabbro, while a combination of mica, hornblende, feldspar and quartz will harden into granite.
“Lava rock” also denotes a type of vesicular basalt, an igneous rock that has a smooth outer surface covering an interior riddled with hollows from gas bubbles. The rocks are used as inorganic mulches and in barbecues to help with heat distribution.
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