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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I recently purchased a new Dell XPS computer with a Windows 7 Professional operating system. I had 17 years of folders and files stored on an Iomega external hard drive in a file folder I named My Documents on 12-26-11.. I planned to move all of the stored folders and files to my new computer's hard drive. I moved some of them to the new computer with no problem.