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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The Dell name is a globally recognized brand and leader in the client solutions category among consumers and business/institutional customers. Use âDellâ in reference to client solutions and corporate functions. See More The Dell EMC name is the brand and business unit that includes products, solutions and services sold, both directly and through the channel, to business and institutional customers. Use âDell EMCâ when referring to our infrastructure solutions that include servers, storage, networking, converged, cloud and data/analytics.