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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Posted by SpeedStep on 11 Feb 2015 6:08. Suggested Answer. The Dell Backup and Recovery Application comes in two versions, Basic and Premium. You can also purchase a Cloud Storage option along with the Basic or Premium versions that will allow you to back up online. Please note: The Premium version is for local backup only (to a hard drive or USB drive) and does not include cloud storage.