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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Founder Michael Dell and investment firm Silver Lake are taking the PC maker private in a $24.4 billion deal. Michael Dell has teamed up with investment firm Silver Lake to buy computer maker Dell, the company he founded as a 19-year-old in 1984, in a deal valued at about $24.4 billion. After the transaction closes, Michael Dell will continue as CEO and chairman of the company, according to a statement.