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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Associated Press. Dell is buying data storage company EMC in a deal valued at approximately $67 billion. Shareholders of EMC Corp. will receive about $33.15 per share, which includes cash plus tracking stock linked to part of EMC's economic interest in the VMware business. That's a 19% premium to EMC's Friday closing...