Gabbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, pyroxene and sometimes olivine. The specimen shown above is about two inches (five centimeters) across. Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material.hese rocks include andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff. Pictures and brief descriptions of some common igneous rock types are shown on this page. Diorite is a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende and sometimes quartz.
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When energy is needed, the water is released to flow through turbines, generating electricity. Ninety-five percent of stored energy currently on the grid is in pumped hydro. Pros: Can store large amounts of energy â 10,000 MWh in a reservoir a kilometer in diameter and 25 meters deep. Storage installations last a half-century or more. Cons: Requires space for a deep reservoir, and water to fill it. Low storage capacity despite the large volume of water involved.